If you win already you can take back to your original bet so you won't get too greedy sometimes people keep testing until when and where they can still manage to hit a jackpot or profit so just one lose isn't enough to them to consider that they need to get stop for a while and take a look with their balance or situation are they still winning or not. Personally, once I win a large amount I will call out this for a day and make another game for next day so I don't get carried away when I win and lose another money because seems like it slipped only to my wallet and get away because of wrong decision making and making more greedy to urge to earn back those losses or urge back to play more hope to win large pool again.
keeping to this is where the problem lays, almost every one knows they should exit after a hug win but the believe that they can still win some more has been the biggest challenge that ha led to the problem, some times its really difficult to ever refuse trying again with the hopes of winning especially when you are of the opinion that the next chance could be a win again so not trying will means missing out.