[dirtyaura]

And the thing that they also missed is that most of the Top Grossing free IAP games don't have a ceiling for IAP spending. This is very important, as spending follows power law curve, which is very well known fact among free-to-play game developers ("rich oil sheiks subsidizing the game for poor kids")

It's requires a bit of a game design ingenuity to make it work so that you can't just buy your way to victory, especially in multiplayer setting, but is doable.