More eBay fodder here... am interested in your opinions.

I sell just a few thing but have gotten burnt by buyers claiming the item didn't work when in fact they just didn't know how to operate it. I end up eating return shipping to find it works fine. Sometimes the return postage isn't worth it and I just issue a refund on an item that worked fine when I sent it.

Could it protect me by stating a return policy where on alleged "defective" items, the buyer pays return postage which I would refund upon verification of the defect? Curious as to whether eBay would allow a seller to enforce this policy if it's stated in the posting. I realize this isn't buyer-friendly and could result in negative feedback from a buyer who doesn't want to accept the policy.