Amazon accepts returns for 30 days and pays for shipping if you select "Item defective or doesn't work" for your return reason. However, that kind of con may still be very profitable for merchant since many buyers won't bother returning. 1. Pay for couple hundred 5-star reviews before Christmas 2. Get tens of thousands of orders 3. Send people cheap defective items that costs 1/10 of price to manufacture 4. Profit! Even if 80% of buyers return, it could still be profitable.