well, to make things easy...once i called them, their account manager admitted to it. but i'll explain how i first discovered it.
normally, the first thing i do when i load a books home page is log-in (like most people do) but this particular time i forgot to log in and i went straight to checking lines....
i found BUF +10 (last night's game) and this was exactly what i was looking for (everything i could find at my outs was +9.5). i went to make the bet but then i realized i had to log-in....
as soon as i did, the line moved to 9.5 instantly. 1 of 2 possibilites now:
1) either the line just happened to change, bad luck in my case
2) they knew my betting history, had me on a different line and had shorted certain underdogs
i just had a bad gut feeling that it was the 2nd scenario. so i went to bowmans.com again and didn't log in again. i checked the live lines, and still it was buffalo +10....
i then logged into my bowmans account and it went back to +9.5. so now i knew something was going on.
i then called a friend of mine who has an account there (he's just a recreational gambler, not a pro) and he checked his account....
sure enough, his screen showed +10.
i even went so far as to open a new account in a new name just to see what line would be offered......yep.....BUF +10.
so i called customer service and of course the reps denied it (they're local nationals though, so in fairness, maybe they don't even know about this stuff. they just read what their computers tell them)
i knew they were lying so i asked to speak to an account manager (an american) and he was honest about. told me i had been deemed a "sharp" player and would now be given a different set of lines to bet against.
so, like i said, bowmans account manager admitted to it. a lot of books do this, they just don't advertise it (obviously). but it's usually only the smaller, less reputable ones that do it.
very rarely, will you find a true top-notch book (i.e. pinnacle, canbet, wsex, sportingbet, etc.) that would do this.
so, there you have it. the whole background on this. you always hear guys complaining about stall tactics and trying to place wagers and then having the line change instantly against them....they always think there's some conspiracy to keep them from winning. but usually they're just paranoid or full of sh*t.
but the dual lines (1 for rec. gamblers, 1 for those they deem to be sharp) is very real, and unfortunate. it just gives a bad overall impression of that particular book (in my opinion).
i hope this helps....