Great post, especially the graphs comparing sales and revenue. In regards to this comment > 5. There’s no Upgrade or Maintenance Pricing on the App Store You

Great post, especially the graphs comparing sales and revenue. In regards to this comment > 5. There’s no Upgrade or Maintenance Pricing on the App Store You can use in app purchases to add features feature upgrades to the app. Games do exactly that. The only challenge is that you have more maintenance in code and in iTunes connect.