Any poker game that has a reasonable rake will always have long-term winners. The winners will be the players who have the edge. If the players who have the edge now quit the game for some reason, other players will begin to have the edge and become the wnners. If they leave, the next group will win in the decreasing player pool. No site would ever want to discourage the winners, but they also won't cater to them any more than they need to.