I'm not gonna fault eBay for always siding with the buyer as someone who both buys and sells there. I think eBay's reputation as a marketplace hinges on whether or not customers have a satisfactory experience. If customers stop buying on eBay, then eBay doesn't get paid. Since they are not directly in control of the selling process, they have to assume the customer is being honest and they want that customer to come back and keep shopping. A seller doesn't have to accept repeat business from a dishonest customer.
Sellers aren't always the best either, as I keep insisting. Many of them are quite lazy and dishonest in the pursuit of making a sale. You can't arbitrarily pick a condition for the item, it has to be as per eBay's guidelines on video game condition. Many items that should be listed as "acceptable" are listed as "good" through "like new" condition to avoid filters, or outright deceive. Descriptions are often virtually non-existent, or generic. Perhaps worst of all, the lack of concern or effort put into packaging and mailing a fragile or expensive item is at times, frankly disgusting.
If someone ever did ask me for a refund, I would happily issue it upon the safe return of the item. Pretty sure they requiring return-tracking as proof, so at least some effort has to be made.
I love ebay. I use it all the time to import cheap japanese games. I prefer buying used items on ebay, over Amazon any day. Ebay allows users to upload photos of the actual item you're buying, and not just a generic image! You almost never see that on Amazon. Every time I've bought used games or systems on Amazon I get screwed, and have to fight for reimbursement. I've been using the site since 1999 and have never really had any issues.
What irks me about Amazon is the condition and packaging of brand new games from their warehouse. Ridiculous.