I Am T-Pain is 125 in top grossing on the app store. You're contending that that ranking means $15k in monthly revenue (given their .99 price point)? In May of 2010, this ranking on the grossing chart would get you $2300/day. Presumably 1.5 years later, that ranking would get you considerably MORE revenue, no?

Ref: http://blog.iteleportmobile.com/quality-over-quantity-how-we...