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

[ToNYlol]

Do you guys know if Greek does this? I only have an account with them, and bet 300-500 a game on selected games--usually 8 games or so a week. I had absolutely no idea that books would mess with lines per player so all of this is rather disturbing.

Someone mentioned steam chasing. I steam-chased once(bad I know) but did end up winning the bet. Are you saying steam-chasing causes them to mess with your future lines?

Thanks for the cookie clear heads up Performify, I've been running really hot betting dogs(1u=$300) so I bet I'm already flagged.