Sure. But the first person buying it can then push it into the extras repository.
I'm not saying that I don't want to have a market for developers who want to sell their software, but I hope that some developers see that opening their software might be the better route, as I seriously don't believe that there are many developers making some sort of income from the apple app store at the moment - and same goes for the android store. I think Apple really buggered up expections of developers with their app store.