Selling emulators is just wrong. Like @
Caustik said, it's illegal. No matter how you guys try to find a loophole in it, it's illegal. The fact of the matter is you're using their images and IPs. Therefore, it is illegal to do. Now, if you decided to change every single image in the game, then you could pull it off. If you did that, I would personally call you the biggest dumbass ever because at that point, you might as well make a new game. If you don't know how to make a new game, you should be worried about selling emulators because yours will probably end up being another complete disappointment towards the community.
I don't mean to be a dick, but it's true, it's the blunt truth.
(I'm not saying that you want to sell emulators, I'm saying in general for the sake of the community).
@
tdid As far as wanting to help the community, the only way to help would be to release it for free. Even if you update it continuously, it's not helpful to the community because we have no way of benefiting other than you updating it, if something happens and you stop updating it, that screws us really or at least anyone using the emulator.
(Once again, I'm not talking about YOU, I mean in general, if someone is trying to sell an emulator, it's not a good idea.)