>if you're losing very badly and seem like a 'problem gambler', sometimes they'll send someone to try and dissuade you. It's bad PR if the casinos ruin people.

That's a really good point. Casinos aren't a windfall business. They're there to rake the 1% advantage on blackjack. It's important to have people at the tables moving money, not to have 1 person lose their $100k nest egg in 12 hours.