With almost half a million apps in the App Store, the Gold Rush is officially over. 90% of the revenue made on the app Store is made by 10% of the apps on the App store. What are the secrets of the 10%? They must be doing something right, after all they are not super-heroes.

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http://mobileorchard.com/7-ways-to-have-a-top-grossing-app-how-4-apps-did-it/