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The problem it is, i saw so many game, what have big potential :D I dont have enough eth for all those games :D

Thats so true.. I did stop buying into games that are too expensive to start. They will never be mass compatible that way anyways!
Some games have different entry lvls, where you can start with no money but most don't even show anything of the game before they ask for quite big investments. So getting game assets is basically a gamble!