I am
very bothered by
Ultimately, the state of the market may demand repurchasing some applications—especially if others follow the lead of developers like Pixelmator and Sophiestication, who are shifting their sales to the Mac App Store on an exclusive basis. At a certain point, you will only be able to get updates for those programs via the Mac App Store.
found in
'Installed' apps, the Mac App Store, and you.
At that point, we'll all have to begin thinking seriously about how badly we really need those apps, and I can envision the eventual deterioration of many theretofore wonderful "Mac experiences."