Who of us wouldn't like to make a living on making games?
I guess it's possible, but quite difficult and alot of work. I can only tell you about my own experience. I am a student and I have developed a little game that's on the android market. It's a casual game, programmed with rough edges and the graphics are not the best. It has room for improvement but still a nice game I guess. I don't know what impact quality has on download rates. It's a free game with ads on it. I think the most important thing is marketing. There are tons of games on the play store, so you have to advertise your game one way or the other. I added my game to some android gaming sites and did some forum posts. What surprised me is that I have constant download rates per month since I released it 12 months ago.
So from my experience I'd say you have to make good games and even better marketing