That's exactly the problem with most people when it comes to gambling, they don't know how to recognize when enough is enough and continue gambling themselves into a hole. There usually needs to be some outside influence to drag these people away from the game to save them from themselves, otherwise few people have the willpower to stop even if they do realize the problem they are facing.
I agree with you because it is hard to determine when enough is enough because we feel that we can win more money if we continue to play. Maybe there are only a few people that can get out from the gambling places, and they can feel satisfied for anything the result that they can get in that day. We need to learn about enough is enough in the gambling game so we can control the emotion that will always be related in the gambling game.
At least they can make their own targets such as how much time is provided for gambling or what profit targets must be obtained in one day, maybe so they can control their emotions better compared to playing gambling with greed. So if they have a target for gambling they will at least feel enough and have to stop after reaching the target. But this can also backfire if they don't reach the target easily.