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In the most of the occasions, it would seem to me people are more likely to stop gambling or close their gambling session when they are losing money or when they are having a very back streak, and if you think about it, it makes sense and that is why casinos are so profitable for their owners, when gamblers lose, the house wins, that is not a secret.
If an important percentage of gamblers out there withdrawn from their session when they are having a winning streak or when they are in profit, then gambling would not be as profitable as it is to casino owners, it would taken them more to get the same amount of money from losing gamblers.
In my personal case, what I do is setting up a very rigid gambling budget and follow it very closely, it is usually a very humble one, money one can afford to lose, as everyone calls it.