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Hopefully, he can control his passion because when the passion becomes bigger and hard to control, we can forget our purposes playing gambling.
So far, I see he can control his playing and win much money, which many of us can not get.
Maybe describing him as an experienced gambler could be good as I still consider him one of the lucky gamblers.
Hopefully, he can share how to control his temptations because we always face them every time we win.
The "balloon" idea came into my mind. How about send him the money and let him play the game and if he wins, he will divide that win money to both of us hahaha

Joking

Guessing, I think most of the time he is successful in controlling that "passion" that you're talking about, but sometimes there would be those times that he will get agressive. It is true, but in his case, I know he knew when to pause and just continue on other time. That is the thing that I really want to learn so I wouldn't be lossing my balance.
The idea isn't new, there are peeps who are doing that.