I think it could be very beneficial for the USB miners. Just ship to a few central shipping facilities in large amounts and then sell individual units at retail prices to the public.
At first blush it sounds interesting, but I hate to be at the mercy of Amazon when it comes to any future pressure from outside entities that the product is illegal,no matter how ridiculous such a claim might be. Hopefully the group buy system with prove efficient enough, but the day AM has the problem of needing a larger retail solution will be a very good day indeed...