Now chase the American dream and become a millionaire by developing apps for the App Store. No we are not giving you bad career advice but stating the truth here. iPhone app developer Tapulous have admitted that they have been raking in big bucks thanks to their "Tap Tap Revenge" game series . The game has been installed more than 20 million times. In fact Tapulous raised $2.8 million from investors and while they won't reveal their sales date, one can assume they are laughing their way to the bank.