You can get rich fast developing for the iPhone. I read an article once by a novice game designer who started making $1,000+ a month for a Tetris type game. He said the iPhone market was flowing with milk and honey, as rich businessmen buy iPhone's for their kids, grandkids, nieces and nephews who promptly purchase every app on the App Store and show off their new hip gadget to their friends.
Within a month this guy started receiving checks from Canada, Europe and even Japan! So good luck Gan, perseverance will definitely pay off.