Jason Snell summarizes a presentation by Rich Siegel of Bare Bones on the App Store:
For many Mac apps, the Mac App Store is a good home. And the store itself continues to evolve. But in the past few years developers have gotten a better view into all of its quirks and frustrations, and for some of them it’s just not worth it.
Many of these frustrations occur at the end of the development cycle. In small companies the same people are involved in marketing, sales, development, and support. Simultaneous challenges on multiple fronts can make App Store launches especially challenging for independent developers.