Nope, that's not what it is. He explicitly states that he excludes the free apps in the revenue analysis. He uses a combination of numbers from Apple and from

Nope, that's not what it is. He explicitly states that he excludes the free apps in the revenue analysis. He uses a combination of numbers from Apple and from other 3rd party services to come to the median revenue per paid app at something like $680/year. He also fully acknowledges that there are some extreme examples that make it big, but that half of all paid apps are currently making less than $680/year. This is a pretty thorough analysis.