Disclaimer: I only read the first post in this thread. When I read the story, I wasn't surprised at all, not in the very least. I am known for hating best buy for their propensity to lie to their customers and provide the worst customer service, yet be hugely successful. If this happened to me, I would've reacted in a similar manner. Is it correct to blow up on the girl at the CS counter, probably not. However, after she says "there?s nothing we can do for you", you would think to ask for the manager. Since BB managers are always "in a meeting", that is worthless. Even getting a hold of one would likely get you a "nothing we can do" response. I hate this store, if you shop there; it's just a matter of time before they get around to screwing you over in some way.
Is it possible that the customer is trying to scam them... yes. However, since this type of problem and other deceptive practices seem to hover around bestbuy like flys on sh!t, I think it's just another example of why everyone should avoid this store like the plague.
Edit: cavemanmoron makes a good point, this "service" may involve a charge, why should I have to pay for this? Can you imagine an ad for this "service" in store: "For only $15, we'll check your purchase from us to make sure you aren't getting ripped off." I realize that the store manager is referring to the "service" of unpacking the computer and making sure it is in good, working order, which you could argue is a service that demands a fee to be collected. However, he is pretty much saying "Hey, you didn't pay to have us check it out, so therefore you took the risk that you'd get something other than what you bought." Even if it is free, I shouldn't have to have an item "checked" to receive my purchase.