The author does not even touch on the ease of use for paying for content; in the case of in-app purchases the walled gardens are far ahead of the open web.

I'm not quite sure of what to make of his claim that he does not know of anyone who is making money from the walled gardens. Epic Games famously stated that Infinity Blade actually makes them more money than Gears of War when figured on a man-years vs revenue basis. http://www.ijailbreak.com/applications/infinity-blade-ios-ep...