Unless you are betting ML dogs or betting huge wagers, even hitting 60% is no big deal. It is all still just a grind.
If you are betting a max of ten games a week and hitting 60% that means after two season your record would be around 170-115. Averaging -107 per side and even betting a dime a game is "only" going to be a profit of about 44K. You can make close to that risk free taking leads and buying back in baseball in that time period.
Of course this brings up the old argument of straight wagering versus adjusting bet amounts. But if you do the latter, win percentages means absolutely nothing.
Football is a fools game unless you are doing it for fun, grinding it out HOPING to make some money by hitting 53-54% (for that you can just flip a coin), or you pick and chose 4 to 5 games a year and go balls out on them and hope you lose none or one.
One other caveat, if people ignored the line altogether, especially in the NFL, they would be so much further ahead they would scare themselves.
Buy a book with all the schedules. Check each game now that you want to bet for the year. Bet each team that you check to win, either on the ML or with the points. For example say you look at 11/28 and see Tenn at Hou. You think that that is a win for Tenn. So you mark it. With no regard to the line, you bet that game when it gets here. At the time you always look for the best lline avaialable, but your mind id already made up, and won't be made up after you look at at some arbitrary number.
There isn't a person in the world that can look at a number and say one team has more "value" than the other and pick them consistantly enough to wager without worry. Not even all the urban myths and legends that get touted on this board. Even the ones that supposedly average 100K per play. Even if they only bet 20 games a year and hit 60% that is still about a quarter mil in profits a year. I don't care who you are 240K is a nice year for something that is "easy".