Distimo has released an interesting publication which looks at the Apple iTunes App Store – even though that is not, by far, the only app store in existance, it is the one which started the App Store Phenomenon.
Sadly, it is also the one which declared the extincion of the paid app. The chart below shows the falling percentage of classic paid apps over the years:

In addition to that, the following data could also be useful:

Find out more in the PDF…
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- 43% of UK smartphone owners won’t download further apps or games
- Apple App Store 39 times bigger than Windows Marketplace
- Ovi Store beats Apple App Store on average downloads per app
- More than 30 percent apps pulled down from Android Market, Windows Marketplace continues to be exploited