>Allow us to charge a nominal fee to for major upgrades to our apps. Right now new versions either have to be made into all-new apps, or we have to give away all new versions for free. There’s no way to charge an upgrade free. If I buy a Mac or iPhone from Apple I can trade it in towards a new one when I upgrade, but users can’t do the same thing for software. All the developers I know are suffering right now because Apple has prevented us from offering special upgrade pricing. It’s completely unsustainable to ask developers to continue supporting their apps but also to forbid them from charging for upgrades.

I don't understand. Aren't freemium apps allowed on AppStore? There are lots of apps with in-app purchase upgrades.