If its their policy to allow customers to return products if they dont like them than go for it. Its alot of money to be out for products that dont work.
I have worked in retail so I know how they do some things. They dont like to lose money. They dont get to write off alot of things and only some suppliers will except returns of their merchandise. Not to mention it is very timely to return anything to a supplier. Knowing this makes me think we most likely do buy products that have been used and returned.