I have no idea if accepting returns represents the majority or minority of SF B&S transacts, but that's why it always pays to state your terms very clearly. If anyone else who is an infrequent seller here is reading this, remember it well. In all honesty, at this point, it's all a power play. If you don't plan to sell anything else on here, you can tell him to shove it (as long as you've met any chargeback requirements) and win. If you do sell stuff on here and it's a senior member with some pull, you might have to eat it. Sucks for you either way. Personally, I think it's unreasonable to want to return the item in question, provided they're new or very near-new and were sold at this kind of discount. Them's the breaks in online buying.