Theirs nothing like gain in gambling, what is actually happening in the gamblling is grace to succeed, talking of greediness is happening directly in gambling, because i know that some gambling like casino and poker game their is nothing like greedy because as a gambler you have your own target of getting what you want in gambling.
Which direction are you taking it? No gain, no greed in gambling? You are taking it far and not correct as you contradict yourself as well. Try to know the difference between grace and luck, we don't have grace in gambling, we have luck, and grace does not leave you easily, luck does, it can appear and disappear at any time. That is why we possess grace, but luck is temporary. Aside from that, you might be greedy as a gambler, and being greedy does not mean the gambler does not have initial plans and targets, it is when the gambler does not care about them by being emotional while gambling.