It is ironic that the newbies that are the luckiest at the beginning are in fact the ones that could suffer the worst effects from gambling, and this is because in their minds gambling will go from a hobby which they may enjoy once in a while, to a way to make money in a consistent way, and this is a very problematic change on their beliefs, as there is no way for someone like them to actually achieve their goals, so very soon they will lose all the money they won and more.
I think, those who are negatively impacted by their gambling, Usually they force themselves to play again to get a much bigger income than before. Usually these gamblers have high enough self-confidence so they keep playing again. In my opinion, this is carelessness or greed that occurs in every gambler. If we have made a profit, it would be better if we don't repeat the mistakes that happened before, we should stop and take the profit home and enjoy it.