As other sellers have explained, ebay decided many years ago to err on the side of pleasing and keeping buyers coming back to ebay. In my experience, most abusive buyers never sell on ebay, at least not with same user ID. ebay will back the 30-day money back guarantee in the absence of "incontrivertible" proof of abuse of the return policy.
However, after you pay for the return of your item (assuming you think it can be resold in returned condition), IF you can document EVIDENCE of the abuse of the return policy, you should file a report on the buyer's abuse. Buyers do get their accounts suspended with a number of well-documented, credible reports from different unique sellers., within a certain period of time. I believe it used to be 3 accepted reports of return abuse within a year. You should do this if you consider it warranted for benefit of all buyers. Don't hold your breath, even if the buyer is later suspended for return abuse, waiting for ebay to automatically correct the abuses allowed, with refunds of return shipping and other expenses to all sellers harmed by the buyer.
