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I think this may sum it up: it's all for the fun. If you expect to earn some bucks out of your games, then don't bother doing a Pokémon game unless you're quite the guy and figure out a way to come around Nintendo's intellectual property. It's for the sake of the art and for the fun we do...
In my opinion, it may be in part a matter of exceedingly high ambitions without a full understanding of the problem/project itself. It just feels so great to think "Oh, I will create this and that and it's gonna be amazing!": marvelous fuel for ambition. But then, most face the real problem...