Ideas are a dime a dozen, it's following through on the concept that's rare.
I think one process is: Design Document, Market Study (to see if this idea is marketable and to whom), development, advertising. I heard companies do this kind of thing, and even individuals. Sometimes, some guy developes the whole game first and then sells it to a company who then changes it to make it sell better. I think this is how card game Magic came to be. Thing is, you could waste a lot of time developing a game just to find that only a few people want to play it. That would suck. Or maybe not. A labor of love is its own reward.


