Some companies are more than happy to provide returns and refunds to avoid having a dissatisfied customer.
When comparing the cost of a return to the cost of an unhappy customer who does nothing but bitch and moan whenever the product or company is mentioned, a refund is much cheaper.
http://en.wikipedia.org/wiki/Caveat_emptor
".........In addition to the quality of the merchandise, this phrase also applies to the return policy. In most jurisdictions there is no legal requirement for the vendor to provide a refund or exchange. In many cases the vendor will not provide a refund but will ......"