People say that you can't do it by credit/debit card because of the risk of a chargeback, that's bullshit. I just purchased a £2000 Gibson by debit card, same thing. How is it different all of a sudden just because the product is bitcoins?
Well, it's pretty easy to hide bitcoins and pretend you never got them; not so much with Gibson, there is a whole postal track record and the physical object in your house, etc.