>> Casinos in vegas have no idea if you're deep into a gambling session or not.

Yes and no. The slot machine has no idea. But the casino certainly does. They do stuff like track you with membership cards, detect when you're frustrated and about to leave, and "helpfully" show up to offer you a free meal so you'll stay.

It's diabolical, really.

http://www.npr.org/blogs/money/2011/11/15/142366953/the-tues...