I find it strange that people would pooh-pooh Marco's argument away. Marco wrote an article two years ago called "The Mac App Store isn’t for today’s Mac developers" (http://www.marco.org/2010/10/29/the-mac-app-store-isnt-for-t...) so he obviously knows the appeal and potential of the App Store.
If anything, they should hear him out more because he was an early advocate.