While stores are not obligated to return merchandise unless defective the fact is that (large) stores do not lose money off of returns. First of all, all stores markup their merchandise and secondly merchandise that is defective can be returned to the manufacture as a RMA. I owned a computer store and if a product we bought and sold to a customer was bad and returned to us within a certain period of time we could return it to the company and get a refund or replacement ourselves. We never lost money on returns EXCEPT for the cost of us building a customer computer.