This refund or return policy which you mentioned is another good after sales services companies give to their customers on products purchased.That's very correct. It doesn't make any sense paying for shipping for your business customers who purchased from your business and end up not making any profits from the sale because most of it have gone into shipping fees/cost. There are some companies that don't offer any kind of free shipping unless it is for carrying out their refund or return policy.
Customers will have to make sure they are eligible by meeting all the requirements for getting a refund/return. If they don't, the service will be denied.