There is an explanation for why also. I recently downloaded Simpsons: tapped out. The "game" wouldn't start for two days because it couldn't connect to the Orion servers. I'm not going to spend real money on in-game donuts if it refuses to start. I found out on the forums that it was a common problem. People aren't going to spend real money on something that isn't reliable.

(NOTE: actually I wasn't going to spend the money anyway. It isn't a game. It is a Skinner Box).