If you are a dealer, then yes, I think you should have a 100% satisfaction guaranteed policy. But individuals, I think a return policy should be in the discretion of the Seller and I think that barring a misleading or untruthful For Sale Thread, an individual Seller should not be obligated to accept a return for any reason whatsoever. Who knows a Seller's situation...maybe he is unloading his collection to pay his electric bill, or medical bills, etc. Barring anything fraudulent or misleading, I don't think think he should be required to accept a return. That being said, I do think individual sellers on BF should make it clear in their sales post exactly what the return policy is. If the thread clearly states that no returns will be accepted (with the exception of fraud of course), then the Buyer consumates the deal subject to those conditions.