Essentially, any person on earth can buy from Amazon.com (or countless other online retailers.) Let’s see, what’s involved in such a transaction? Click? Yep, pretty much. No disputes, withdrawals, re-offering, reselling … just “click” and it’s yours.
Further, my neighbor who buys from Amazon all the time says that their return policy is straightforward as well — not happy? Return it. There is no question that commerce generally is moving this direction as customers demand more flexibility and ease of buying.