I don't mean to take anything away from Ron Johnson (how could I, who am I?), but I'd like to take a crack at answering this rhetorical question.
Apple's retail presence is unique for many reasons, but a big part of its uniqueness stems from the fact that they are the only computer retailer that has their own stores. The key point there is that you're going to buy a computer at a store owned and operated by the company that made the computer. That is entirely unique in the world of computing, and I'd speculate that there is a significant incentive present here.
When you buy something from Best Buy, Wal-Mart, Target, etc, you're dealing with a retailer whose primary interest is in keeping he customer just happy enough to come back and shop with them again. If they can find a way to pawn the customer off on the vendor, they will. It's in their interest to do so.
Every customer knows this game: You bring a product back to a retailer. The retailer tells you that you must talk to the manufacturer. You call the manufacturer, and they explain that the retailer should just accept the item as a return and give you another one... or some similar explanation.
The point is that the customer ends up bearing the burden of managing this process. What a pain in the ass! I bought this thing and I just want it to work. I want to talk to someone familiar with the product. I want to talk to someone who actually cares about my feelings about the product.
The astute reader will note that each of the typical gripes above are solved by the Apple store formula because the employees are beholden to Apple, who is also the product manufacturer. They are the final stop on the responsibility train. No one else to talk to. Retail panacea!
Consumers know this. I know more than one person who are long time Apple fans, and they'll all tell you the same thing: buy from the Apple store directly instead of a reseller because they'll take better care of you.