I think the author addresses the point about value decently enough. He says that you'd better build an app that's worth what you're charging, or you're going to

I think the author addresses the point about value decently enough. He says that you'd better build an app that's worth what you're charging, or you're going to og out of business. The comparison between iphone apps and desktop apps is strange to me. I don't think anyone would actually want to have photoshop on an iphone. Desktop computers and mobile devices are obviously used in different contexts and thus their software have different criteria for usefulness.