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You will not be too greedy and it will be wrong to expect big wins again and again. Basically greed destroys people. Gambling depends on luck, if you are lucky you will win, if you are not lucky you will lose. So you should gamble with the intention of having fun, if you are lucky you can win big.
Now I have no story of losing big, I gamble for fun, and not gamble with more money than I can afford to lose. Now I also lost but not financially affected.
Greed will always lead someone to ruin, I think it can happen in all things, not just in gambling. Gambling with a small budget will make you fine, there is no pressure after losing, life can go on as it should, so there is no neglected responsibility. Winning will be the only thing that brings pleasure in gambling, but it must be understood that it does not happen every day. I think experienced gamblers will understand it very well, self control not to exceed the limit is the main foundation when gambling.