How does a book determine if you're a sharp?

[B00T]

books can look at your bet history

how much do you bet, are you hammering rogue lines, are you consistently beating the closing line, do you steam chase, etc.

as for Bodog I'd pay like $2500. It is worth more in terms of getting like 1% edge per bet, but I don't see the point in paying for something you can get for free elsewhere.

The square lines aren't that much different and not on any bettors top 25 list of things they care about. People make such a production over this and it's a complete waste.