After the first win i think o most 95% of gamblers want to bet again because you have a feeling that you can continue the winning run for sure. I personally after a win never stop so maybe its a mistake but it gives you a huge boost that you can win big that day and in most cases that dosent happen
First winning gives everyone that drive to keep on gambling, it takes a lot of discipline to stop after making your first profit, so this is quite normal. But the more experienced you become you'd realize that Winning in the long run isn't really possible. It's better to win and not gamble again if you can but not everyone disciplined enough to stay away from it. After your first win you fall into a mental trap