Nothing! Or close to nothing. Don’t do it for the money, do it because it’s a fast and easy way to make a game. That being said, it’s nice when you start seeing slightly less cents and slightly more dollars:
Today my newest game Wall of Fingers earned 71 cents on its own through ads, which is almost as much as all of my games have made combined this year (which was a little over 1 dollar). I know it’s not a lot, but it feels exciting and it gives me incentive to keep going. This was my first year releasing games and I have currently released 6 games, with a 7th coming by the end of the month for 1GAM (working with RainbowSexyFish). I’m hoping that soon I will have enough games under my belt to create a steady trickle of pocket change!