Poker sites hardly ever do it as its so easy to cheat.
Against a casino your playing the casino, they can restrict it.
But can you imagine a $20 ND poker room with a $100 rake restriction and a $40 max cashout?
Ah man that would be something. But i think if they offered a deal like that then they could be able to keep from losing out so much money. Quick delete this post before they get any bright ideas!lol