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""It’s the belief of some that only a small number of mobile developers have the lion share of downloads and revenue on the App Store, and that the rapidly increasing number of games and apps on iOS means that a very small percentage of developers are now seeing success compared to before.
However, according to a new report from mobile analytics firm Flurry, there is still a good portion of success on the App Store taken by “Middle Class” developers – that is, mid-tail developers who focus on loyal fanbases and particular niches, and find notable success as a result.
http://www.gamasutra.com/view/news/204394/The_rise_of_the_Middle_Class_mobile_game_developer.php