There are both cost and copyright issues at play. Vinyl is considered software, and you usually can only exchange software like-for-like. It's kind of an antiquated concept, but if you can prove your copy is defective, the rights-holder can annul the copy without having you send it back. Second, and biggest, is cost. I work at a well-known online music seller. Some of our vendors (the distros and even labels/artists themselves) require us to send bad stock back, some will take our word that the item is trash, OR they will ask some kind of proof of the damage. This is NOT necessarily because they don't trust us, or that we don't trust our customers. It's because there is NO SUCH THING as free shipping. Someone is paying for it. If you can show the defect, we don't need you to send it back. And our vendor doesn't need us to send it back to them. That there saves two unnecessary shipments. And at $8-$15 per shipment (real cost), that starts to add up quickly.