Selling games on the net does have some downfalls. Its not impossible though. I find that it is easy to make custom games for friends for a fee. I have been doing that for some time. I don't make a million but it is better than a kick in the pants. They just tell me what type of game they want along with the entities that they want in it. I then make the game and they pay me and then they get the game.
I don't go to extremes. I just make basic models and textures. If people want something more advanced I charge a little base on the difficulty and detail of the game.
Good luck.
Patience and tolerance are the keys to the passage of knowledge. Even the ones that know the most started with many questions.