Isn't this similar to the iPhone Apps store? No-one has a problem with it there. I know it's Best Buy and they suck and all but if this is done right it could streamline the installation of software onto computers.
It could be the end of 8 o'clock on a saturday night panicked support calls when your parents have to take a plane in the morning and used the "system restore" feature to roll back from a minor problem they were having and reset the computer to factory... 1 click to re-install all the applications they had previously...
I'm not saying that Best Buy is going to build an actual useful program. But they could.