A research conducted by AppsFire shows that the average user has spend $80 on applications for the iPhone (or iPod touch). There are about 1.200 iPhone users that use the AppsFire service.This service can be used to notify friends and others what your favorite apps are. The average user has 65 applications on the iPhone, 15.000 are unique and have an average price of $1,99.
If that price is used as an average (numbers from AdMob) than Apple has earned more than 400 million dollars. The research was done in July and August under 1.200 AppsFire users. Almost 50% of that group is American and the rest comes mostly from France and Japan.