gistfile1.txt

The impact of Apple's continued lack of support for upgrade pricing has been increased by an apparent effort on Apple's part to enforce 3rd party developers trying to accommodate upgrade pricing through their own means:

http://www.omnigroup.com/blog/entry/update-no-upgrade-pricing-for-mac-app-store-purchases

Most of us Mac developers are loyal Apple fans who would like to support the Mac App Store and keep our customers who purchased on the Mac App Store within that system. By not supporting an upgrade mechanism for these customers Apple leaves us in a position where we're forced to either treat Mac App Store customers as 2nd class customers or to forego across the board the expected compensation for major upgrades to our applications.