The casinos own the law, and if they think you're winning too much  they just decide you must have been cheating, even if they can't prove it. There's nothing you can really do. Yes, a person was once kicked out of a casino for winning too much.

What happens when you get overpaid in a casino? You can keep it if it isn't caught right then. If the Casino does catch it you can still keep it since they paid you, but then the casino recovers from the dealer out of his pay.