Poker Rooms don’t ever have to really worry about big winners since all they are doing is providing a place for players to bet against eachother, and taking a small percentage in rake. In poker you play against other players, the house could care less if you win or lose, so they pay you out faster since it’s not there money they are paying you with. With Casino the house has to pay you out of there pocket, some casinos are more reluctant to pay in hopes you lose all of the money back that you won from them. Hope that answers your question…