If they aren't selling computers then this seems like a big fail.
Customer: I've been playing with this PC here, checking out Windows and I think I'd like to buy.
MS Employee: Great! Would you like me to get you a copy of Windows from the shelf?
Customer: Actually I needed a new computer because my old one is dead.
MS Employee: Oh. Well, we don't actually sell the computers.
Customer: Then what are these ones here for?
MS Employee: To show off our software.
Customer: But how do I run your software if I don't have a computer?
MS Employee: Err, well, you'd have to buy one first. You could get one at Best Buy.
Customer: If I go to Best Buy to buy the computer why should I come all the way back here to buy the software when I can get it at the same time there?
MS Employee: Ummm.
At an Apple Store they obviously make the computers and the software that comes with it. If you go try out a Mac at an Apple Store, you can then buy exactly what you're looking at, right there.