This was recently released:
http://gigaom.com/2010/01/12/the-apple-app-store-economy/
In a nutshell:
According to Flurry, Average listed price of a paid app: $3.63
74% of apps listed in the app store are paid. Average listed price of an app (including free): 3.63 x .74 = 2.70 (with rounding)
Only 1/4 of downloaded apps are paid. Average price paid for an app (including free): 3.63 X .25 = .91
http://gigaom.com/2010/01/12/the-apple-app-store-economy/
In a nutshell:
According to Flurry, Average listed price of a paid app: $3.63
74% of apps listed in the app store are paid. Average listed price of an app (including free): 3.63 x .74 = 2.70 (with rounding)
Only 1/4 of downloaded apps are paid. Average price paid for an app (including free): 3.63 X .25 = .91