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I actually saw this data in an article on readwrite about HTML5 recently - you can read it HERE. iOS still has a significant advantage over Android in terms of developer revenue per app. Both of those have an advantage over Windows Phone and, to no one's surprise, BlackBerry.
Median revenue per app:
iOS: $501 - $1000
Android: $101 - $200
BlackBerry: $51 - $100
Windows Phone/Windows 8: $1 - $50