From MacNN:

Analysis of trends reveals the dynamics of how and why iPhone applications sell, claims Pinch Media. The advertising firm notes for instance that popularity feeds popularity, as appearing in a top 100 list increases new users by 2.3 times, on average. The jump is said to be even more dramatic once in the top 10 or 25 apps of a particular category, though Pinch warns that the App Store is structured for rapid turnover.

Popularity feeds popularity?
No fuckin’ way! Since WHEN?!?!?!