I know app bundles were introduced in the iOS App Store and some developers had started using them as a hack around "paid upgrades." Given that they didn't get

I know app bundles were introduced in the iOS App Store and some developers had started using them as a hack around "paid upgrades." Given that they didn't get a mention in the original post, I'm assuming they don't exist on the Mac App Store. Seems like an easy win that could solve half the problems mentioned... (For the record: a user that has already purchased an app in a bundle only has to pay the difference to complete the bundle. So the idea is having version 1 and version 2, each for $30, but sell the bundle for $50. Owners of version 1 can essentially upgrade to version 2 for $20.)