I you are ever going to make bigger project I think it is quite important to be enthusiastic about it yourself and partly making it to yourself. There is always a good chance that there are people who like it as well. Feedback is good for the things you might be blind to, like one thing that was already discussed here, that people understand how your game works, difficulty (this seems to be my personal nemesis when I want to make challenging games they end up to be insanely hard ), controls etc. In my opinion it shows on the final result if people making it were really into it rather than just making it for quick profit.
Personally I would be quite glad if my game would sell all right. Would reduce the amount of pointless uninteresting work I would have to do. Just hopefully there will be time when money is a subject of history and reason will win.