Title: Apple publishes a top-grossing list ( http://www.appannie.com/top/united-states/ has pretty good data), and there is a some anecdotal data out there ( http://taptaptap.com/blog/cameraplus-hits-2-million-sales/ ), but there's very little transparency about what things are like outside of the top 10 grossing apps.  If you provide some data in the comments of this thread (or email them to me -- webwright @ gmail if you'd prefer to keep it out of the public eye), I'll send you spreadsheet of the data I've come up with (I've got about 10 data points so far-- would love to get more-- especially in the lower ranks to see how long the "tail" is).
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