Probably, for most gamblers who are not addicted, this is not even a trick or strategy, but a standard behavior. In general, using this example, you can see the difference between a healthy person and a patient with gambling addiction. If a person is constantly losing and has lost the entire bankroll, it does not mean that he is addicted. If a person wins (that is, he has achieved his goal) and, nevertheless, continues to play, then, as in the first case, he loses everything, then this person is addicted.
Do we have a standard behavior in gambling? I think it is only a common habit, it isn't called as a standard behavior. It has a different definition. 
In the case that gamblers can't stop although they already achieve their goals at that day, it surely can be suspected they got addicted to the games. Or they can have a problem with their mentality. There are people who can't control emotion, so they are triggered to recover their losses as quick as possible. This is absolutely very dangerous because it can lead to huge losses. Well, if we know there are friends or our family members do it, we need to suggest and accompany them to visit doctors or experts.