In Germany, there is a law that anything (I’m sure there are exceptions) sold online can be returned in the 30 days after delivery. So Amazon or not, companies must allow this anyway. Also some non-Amazon online stores offer "returnless refunds" for some items or just ship a new one to you in case of damaged item. Apart from forcing the vendors to pay for retouring the new policy is similar to German regulations and businesses seem to be OK here. Amazon could help (if it doesn’t already) vendors by providing some "rate" on a customer, if they buy a lot and return a little, then likely they are genuinely unhappy with product, and decide upon customer’s history if they are entitled to refund or if they are abusing the system.