I will will disagree with your topic OP. Maybe you should rephrase your topic again because you controlling your emotions cannot guarantee you success in gambling. If its is like that 99% of gamblers that knows how to control their emotions would be a successful gamber. Go and find out what controlling emotions means before bringing it to the public so that you wont change the narrative of what a successful gambler means or feels like.
Both of you are right actually and each gambler differs so basically we are seeing those gamblers that don't have control for themselves that they won't earn much money after they've just won in gambling.
But in real life, we don't know if they're the same person or there's already the life attachment for that daily gambler's life and then with the set of reality that he's dealing with and if he's emotional as well.
Anyway, it's true that someone's control over his emotion doesn't guarantee success in gambling but it helps right.
What do you mean when you say that they are not the same person in real life? It is incorrect to assume that they have different personalities just because they engage in other activities, like gambling. If they gamble and behave in a certain way that is considered unthinkable, it simply means that this is their real personality. Their behavior while gambling or in their daily lives may differ, but it does not necessarily mean that they have different personalities.