Paid Upgrades

Wil Shipley gives a well researched article on the necessity of paid upgrades in the Mac App Store.

For developers, upgrades fund the new software we’re writing, not the current stuff. Think of upgrade revenue as the Kickstarter project for our next product, whether it’s a major version of an existing product or something totally new. We live for those upgrade humps. They keep us warm in the cold months.

Of course, this should also be adopted on the iOS App Store.