It's impossible to stop gambling especially if you've won so much Bitcoin. On the other hand, most people only stop when they have got nothing left.
You are right, I don't think that people they didn't have any greed about money, even too bit greed. So even a gambler win a huge amount that he can live with it in the whole life, they want more.
Yeah, it is impossible that people stop or quit gambling if they already achieve their desire from it. Even i think gamblers play gambling more becasue they have earned from it and in gambling usually gamblers have no limitation to quit gambling in the winning stage. The reason Gamblers have no least stage of greediness.
Yes, no one can stop to gamble even he had achieved what he wanted to achieve from gambling in his life because the greed for more never allows them to sit at their place and they rely upon gambling to meet their basic life needs and for that, they simply move forward to gambling when they face financial crisis. I have also seen gamblers who are at the last stages of life but still they play gambling to earn money.
That's the thing that we need to work on if we are gambling all the time. The greediness inside of us is the only thing that comes between profit and loss. If you know how to control it and limit yourself it would be beneficial for yourself and also for your bank account. What do you even mean by last stages of life? Are they dying? Probably losing all of their money would result to that.
I think greed can never be erased as it is natural thing. But as you said, one can control his greed if cant finish it at all because control is something that totally depends on the person himself.
If you will be the man of strong will power, then controlling greed for yourself would not be a big deal but if the case is opposite then no one can save you from meeting disastrous ends in the end of your life.