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Just a chance or a luck that may happened, we don't know though if that will take place or you are going to lose a lot of money before it happened else, it's just a matter of luck and how it will play you before this kind of situation will take place, it's a case to case situation and only for those who able to achieved that can speak for themselves, but the vast majorities for sure are on the side who lose a lot..
It's actually a question nobody can really answer. Think about it, if you buy some lottery tickets and take him a $100 million jackpot, then for sure gambling has changed your life dramatically for the better. But if the hope is to improve life sustainably through constant gambling, then I am not so sure. It should most likely be for pleasure, which can still be a good thing unless you lose so much money that it affects your life in general.