I think sellers should realise that as far as Paypal refunding money to buyers is concerned, sellers are in the lap of the gods (Paypal).
The buyer simply contacts Paypal lodges a complaint on the basis that the item is not of the quality expected and that is that. The person requesting refund always has the advantage in so far as Paypal have no idea what the quality is like simply because they don't see it. Paypal is one of the very few operations that can take money off you without your agreement. My tip is BE AS CAREFUL AS YOU CAN, not everyone out there is a conman/woman, there are thousands of basically honest sellers and buyers who offer Ebayer the opportunity of obtaining and selling good quality items at brilliant prices. I just happen to be one of them. Enjoy Ebay, it's the best thing since sliced bread.