I'm really happy to hear you enjoyed the talk. To be clear, it's the top grossing app in Sept 09 that was $50. My information for that statistic comes from the Sept. Distimo report available here: http://distimo.createsend4.com/t/r/l/hllhtd/yuldzkhi/r
Thanks for the clarification. There is a big difference between saying that one $50 app did well and saying that "Figures show that the top grossing apps were $50"
As itunes stats show (today), in the top 100 grossing apps list, only three apps are $50 or higher