I assume people have done this before--in fact I think I read someone was fading the Yankees every game last year.
Then that person would have lost money last year.
Yankees were 89-72 last year. If you bet $100 on the Yanks every game last year you would have lost $280. If you bet $100 against the Yanks all year you would have lost $565.
Here's the data you are looking for. Season=2008.
<TABLE id=sortable_table cellPadding=2 bgColor=#ffffff border=0><THEAD><TR><TH>
Record
W-
L (
marg,
% win)
</TH><TH>
$ On
</TH><TH>
$ Against
</TH><TH>
RL Record
W-
L (
marg,
% win)
</TH><TH>
$ On
</TH><TH>
$ Against
</TH><TH>
Over/Under
O-
U-
P (
marg,
% over)
</TH><TH>
$ Over
</TH><TH>
$ Under
</TH><TH name="query_header">
team</TH></TR></THEAD><TBODY><TR bgColor=#ffffff><TD align=middle>105-73 (0.66, 59.0%)</TD><TD align=middle>2760 </TD><TD align=middle>-3600 </TD><TD align=middle>95-83 (0.25, 53.4%)</TD><TD align=middle>1425 </TD><TD align=middle>-2480 </TD><TD align=middle>81-93-4 (0.12, 46.6%)</TD><TD align=middle>-1970 </TD><TD align=middle>195 </TD><TD align=middle>
Rays</TD></TR><TR bgColor=#e6e6e6><TD align=middle>86-75 (-0.19, 53.4%)</TD><TD align=middle>2150 </TD><TD align=middle>-3105 </TD><TD align=middle>90-71 (0.00, 55.9%)</TD><TD align=middle>1965 </TD><TD align=middle>-2815 </TD><TD align=middle>68-88-5 (0.06, 43.6%)</TD><TD align=middle>-2805 </TD><TD align=middle>1250 </TD><TD align=middle>
Astros</TD></TR><TR bgColor=#ffffff><TD align=middle>101-65 (0.38, 60.8%)</TD><TD align=middle>2035 </TD><TD align=middle>-2930 </TD><TD align=middle>85-81 (-0.25, 51.2%)</TD><TD align=middle>1675 </TD><TD align=middle>-2605 </TD><TD align=middle>70-90-6 (0.18, 43.8%)</TD><TD align=middle>-2845 </TD><TD align=middle>1225 </TD><TD align=middle>
Angels</TD></TR><TR bgColor=#e6e6e6><TD align=middle>84-77 (0.02, 52.2%)</TD><TD align=middle>1800 </TD><TD align=middle>-2665 </TD><TD align=middle>91-70 (0.64, 56.5%)</TD><TD align=middle>1185 </TD><TD align=middle>-2155 </TD><TD align=middle>83-71-7 (0.49, 53.9%)</TD><TD align=middle>540 </TD><TD align=middle>-2065 </TD><TD align=middle>
Marlins</TD></TR><TR bgColor=#ffffff><TD align=middle>103-73 (0.79, 58.5%)</TD><TD align=middle>1150 </TD><TD align=middle>-2105 </TD><TD align=middle>84-92 (0.23, 47.7%)</TD><TD align=middle>-850 </TD><TD align=middle>-80 </TD><TD align=middle>79-91-6 (-0.12, 46.5%)</TD><TD align=middle>-2015 </TD><TD align=middle>445 </TD><TD align=middle>
Phillies</TD></TR><TR bgColor=#e6e6e6><TD align=middle>88-75 (0.52, 54.0%)</TD><TD align=middle>940 </TD><TD align=middle>-1700 </TD><TD align=middle>94-69 (0.65, 57.7%)</TD><TD align=middle>2315 </TD><TD align=middle>-3220 </TD><TD align=middle>90-69-4 (0.80, 56.6%)</TD><TD align=middle>1495 </TD><TD align=middle>-2980 </TD><TD align=middle>
Twins</TD></TR><TR bgColor=#ffffff><TD align=middle>97-67 (1.04, 59.1%)</TD><TD align=middle>900 </TD><TD align=middle>-1740 </TD><TD align=middle>83-81 (0.30, 50.6%)</TD><TD align=middle>630 </TD><TD align=middle>-1775 </TD><TD align=middle>82-76-6 (0.58, 51.9%)</TD><TD align=middle>-60 </TD><TD align=middle>-1515 </TD><TD align=middle>
Cubs</TD></TR><TR bgColor=#e6e6e6><TD align=middle>101-72 (0.82, 58.4%)</TD><TD align=middle>830 </TD><TD align=middle>-1670 </TD><TD align=middle>86-87 (-0.01, 49.7%)</TD><TD align=middle>70 </TD><TD align=middle>-1020 </TD><TD align=middle>76-86-11 (0.27, 46.9%)</TD><TD align=middle>-1700 </TD><TD align=middle>110 </TD><TD align=middle>
Red Sox</TD></TR><TR bgColor=#ffffff><TD align=middle>86-76 (0.33, 53.1%)</TD><TD align=middle>805 </TD><TD align=middle>-1665 </TD><TD align=middle>88-74 (0.26, 54.3%)</TD><TD align=middle>1670 </TD><TD align=middle>-2515 </TD><TD align=middle>74-77-11 (0.47, 49.0%)</TD><TD align=middle>-1020 </TD><TD align=middle>-595 </TD><TD align=middle>
Cardinals</TD></TR><TR bgColor=#e6e6e6><TD align=middle>79-83 (-0.41, 48.8%)</TD><TD align=middle>685 </TD><TD align=middle>-1555 </TD><TD align=middle>82-80 (0.31, 50.6%)</TD><TD align=middle>-1375 </TD><TD align=middle>495 </TD><TD align=middle>84-72-6 (1.51, 53.8%)</TD><TD align=middle>470 </TD><TD align=middle>-2125 </TD><TD align=middle>
Rangers</TD></TR><TR bgColor=#ffffff><TD align=middle>90-77 (0.44, 53.9%)</TD><TD align=middle>450 </TD><TD align=middle>-1095 </TD><TD align=middle>88-79 (0.15, 52.7%)</TD><TD align=middle>660 </TD><TD align=middle>-1705 </TD><TD align=middle>78-81-8 (0.40, 49.1%)</TD><TD align=middle>-1100 </TD><TD align=middle>-555 </TD><TD align=middle>
White Sox</TD></TR><TR bgColor=#e6e6e6><TD align=middle>75-87 (-0.56, 46.3%)</TD><TD align=middle>260 </TD><TD align=middle>-1205 </TD><TD align=middle>80-82 (0.06, 49.4%)</TD><TD align=middle>-1245 </TD><TD align=middle>170 </TD><TD align=middle>74-85-3 (0.20, 46.5%)</TD><TD align=middle>-1865 </TD><TD align=middle>260 </TD><TD align=middle>
Royals</TD></TR><TR bgColor=#ffffff><TD align=middle>91-75 (0.33, 54.8%)</TD><TD align=middle>185 </TD><TD align=middle>-935 </TD><TD align=middle>80-86 (0.01, 48.2%)</TD><TD align=middle>-1610 </TD><TD align=middle>665 </TD><TD align=middle>70-85-11 (0.10, 45.2%)</TD><TD align=middle>-2365 </TD><TD align=middle>745 </TD><TD align=middle>
Brewers</TD></TR><TR bgColor=#e6e6e6><TD align=middle>86-76 (0.63, 53.1%)</TD><TD align=middle>35 </TD><TD align=middle>-855 </TD><TD align=middle>80-80 (0.51, 50.0%)</TD><TD align=middle>-265 </TD><TD align=middle>-585 </TD><TD align=middle>68-84-8 (-0.36, 44.7%)</TD><TD align=middle>-2010 </TD><TD align=middle>825 </TD><TD align=middle>
Blue Jays</TD></TR><TR bgColor=#ffffff><TD align=middle>89-72 (0.44, 55.3%)</TD><TD align=middle>-280 </TD><TD align=middle>-565 </TD><TD align=middle>74-87 (-0.22, 46.0%)</TD><TD align=middle>-1115 </TD><TD align=middle>265 </TD><TD align=middle>67-89-5 (-0.02, 42.9%)</TD><TD align=middle>-2910 </TD><TD align=middle>1490 </TD><TD align=middle>
Yankees</TD></TR><TR bgColor=#e6e6e6><TD align=middle>72-90 (-0.73, 44.4%)</TD><TD align=middle>-745 </TD><TD align=middle>-25 </TD><TD align=middle>74-87 (-0.15, 46.0%)</TD><TD align=middle>-2965 </TD><TD align=middle>1795 </TD><TD align=middle>80-76-6 (0.51, 51.3%)</TD><TD align=middle>-215 </TD><TD align=middle>-1360 </TD><TD align=middle>
Giants</TD></TR><TR bgColor=#ffffff><TD align=middle>75-86 (-0.27, 46.6%)</TD><TD align=middle>-785 </TD><TD align=middle>-30 </TD><TD align=middle>80-81 (0.09, 49.7%)</TD><TD align=middle>-1450 </TD><TD align=middle>515 </TD><TD align=middle>60-90-11 (-0.09, 40.0%)</TD><TD align=middle>-3845 </TD><TD align=middle>2235 </TD><TD align=middle>
Athletics</TD></TR><TR bgColor=#e6e6e6><TD align=middle>88-82 (0.36, 51.8%)</TD><TD align=middle>-795 </TD><TD align=middle>-95 </TD><TD align=middle>84-86 (-0.06, 49.4%)</TD><TD align=middle>-280 </TD><TD align=middle>-770 </TD><TD align=middle>77-85-8 (0.15, 47.5%)</TD><TD align=middle>-1545 </TD><TD align=middle>0 </TD><TD align=middle>
Dodgers</TD></TR><TR bgColor=#ffffff><TD align=middle>81-81 (0.27, 50.0%)</TD><TD align=middle>-805 </TD><TD align=middle>-115 </TD><TD align=middle>83-79 (0.14, 51.2%)</TD><TD align=middle>-45 </TD><TD align=middle>-945 </TD><TD align=middle>78-80-4 (0.64, 49.4%)</TD><TD align=middle>-945 </TD><TD align=middle>-580 </TD><TD align=middle>
Indians</TD></TR><TR bgColor=#e6e6e6><TD align=middle>88-73 (0.47, 54.7%)</TD><TD align=middle>-890 </TD><TD align=middle>-45 </TD><TD align=middle>82-79 (-0.34, 50.9%)</TD><TD align=middle>820 </TD><TD align=middle>-1730 </TD><TD align=middle>83-66-12 (0.55, 55.7%)</TD><TD align=middle>1060 </TD><TD align=middle>-2535 </TD><TD align=middle>
Mets</TD></TR><TR bgColor=#ffffff><TD align=middle>67-95 (-0.92, 41.4%)</TD><TD align=middle>-1185 </TD><TD align=middle>460 </TD><TD align=middle>80-82 (0.04, 49.4%)</TD><TD align=middle>-1305 </TD><TD align=middle>340 </TD><TD align=middle>84-70-8 (0.96, 54.5%)</TD><TD align=middle>725 </TD><TD align=middle>-2155 </TD><TD align=middle>
Pirates</TD></TR><TR bgColor=#e6e6e6><TD align=middle>68-93 (-0.53, 42.2%)</TD><TD align=middle>-1425 </TD><TD align=middle>755 </TD><TD align=middle>84-75 (0.21, 52.8%)</TD><TD align=middle>-45 </TD><TD align=middle>-850 </TD><TD align=middle>83-67-9 (0.93, 55.3%)</TD><TD align=middle>1250 </TD><TD align=middle>-2480 </TD><TD align=middle>
Orioles</TD></TR><TR bgColor=#ffffff><TD align=middle>82-80 (0.09, 50.6%)</TD><TD align=middle>-1630 </TD><TD align=middle>860 </TD><TD align=middle>72-90 (-0.43, 44.4%)</TD><TD align=middle>-2675 </TD><TD align=middle>1610 </TD><TD align=middle>79-75-8 (0.33, 51.3%)</TD><TD align=middle>-245 </TD><TD align=middle>-1245 </TD><TD align=middle>
Diamondbacks</TD></TR><TR bgColor=#e6e6e6><TD align=middle>74-88 (-0.59, 45.7%)</TD><TD align=middle>-1650 </TD><TD align=middle>865 </TD><TD align=middle>73-89 (-0.44, 45.1%)</TD><TD align=middle>-2200 </TD><TD align=middle>1260 </TD><TD align=middle>73-77-12 (0.31, 48.7%)</TD><TD align=middle>-1025 </TD><TD align=middle>-340 </TD><TD align=middle>
Reds</TD></TR><TR bgColor=#ffffff><TD align=middle>74-88 (-0.46, 45.7%)</TD><TD align=middle>-2000 </TD><TD align=middle>1180 </TD><TD align=middle>74-88 (-0.48, 45.7%)</TD><TD align=middle>-2100 </TD><TD align=middle>1265 </TD><TD align=middle>75-79-8 (0.43, 48.7%)</TD><TD align=middle>-1040 </TD><TD align=middle>-355 </TD><TD align=middle>
Rockies</TD></TR><TR bgColor=#e6e6e6><TD align=middle>72-90 (-0.15, 44.4%)</TD><TD align=middle>-2390 </TD><TD align=middle>1425 </TD><TD align=middle>82-80 (-0.14, 50.6%)</TD><TD align=middle>20 </TD><TD align=middle>-855 </TD><TD align=middle>70-88-4 (0.43, 44.3%)</TD><TD align=middle>-2610 </TD><TD align=middle>955 </TD><TD align=middle>
Braves</TD></TR><TR bgColor=#ffffff><TD align=middle>59-102 (-1.14, 36.6%)</TD><TD align=middle>-2485 </TD><TD align=middle>1535 </TD><TD align=middle>83-78 (0.00, 51.6%)</TD><TD align=middle>-1490 </TD><TD align=middle>725 </TD><TD align=middle>77-76-8 (0.36, 50.3%)</TD><TD align=middle>-620 </TD><TD align=middle>-875 </TD><TD align=middle>
Nationals</TD></TR><TR bgColor=#e6e6e6><TD align=middle>74-88 (-0.22, 45.7%)</TD><TD align=middle>-3110 </TD><TD align=middle>2380 </TD><TD align=middle>73-89 (-0.57, 45.1%)</TD><TD align=middle>-1935 </TD><TD align=middle>980 </TD><TD align=middle>80-76-6 (0.84, 51.3%)</TD><TD align=middle>-255 </TD><TD align=middle>-1165 </TD><TD align=middle>
Tigers</TD></TR><TR bgColor=#ffffff><TD align=middle>63-99 (-0.78, 38.9%)</TD><TD align=middle>-3630 </TD><TD align=middle>2795 </TD><TD align=middle>76-86 (-0.40, 46.9%)</TD><TD align=middle>-1960 </TD><TD align=middle>1075 </TD><TD align=middle>75-81-6 (0.54, 48.1%)</TD><TD align=middle>-1355 </TD><TD align=middle>-145 </TD><TD align=middle>
Padres</TD></TR><TR bgColor=#e6e6e6><TD align=middle>61-101 (-0.86, 37.7%)</TD><TD align=middle>-3720 </TD><TD align=middle>2905 </TD><TD align=middle>76-86 (-0.44, 46.9%)</TD><TD align=middle>-1710 </TD><TD align=middle>760 </TD><TD align=middle>78-77-7 (0.34, 50.3%)</TD><TD align=middle>-565 </TD><TD align=middle>-865 </TD><TD align=middle>
Mariners</TD></TR></TBODY></TABLE>