I disagree. The old school caveat emptor conventions change when the buyer has no opportunity to handle the item prior to purchase.
Internet seller responsibility is to clearly disclose all defects in the ad. Also, it is seller responsibility (and risk) to make sure the stated condition is upon receipt by the buyer. The seller must be held responsible for properly packing, tracking and insuring because they are the party in direct control of those protections.
Also, in the case of undisclosed defects, it should be the buyers decision whether to return or repair. This is because the buyer did not intend to buy a repaired, broken bass; and shouldnt be forced to do so.
Also, because undisclosed defects are a seller default, the seller should be responsible for reimbursing the return shipment cost to the buyer. Otherwise, the buyer is forced to pay a penalty for a sellers inaccurate ad. This is also in line with product return conventions for mail order companies.
As far as I know, my thoughts are in line with eBay rules. Like them or not, eBay has had plenty of time to figure out a working protocol for internet sales of used items. Furthermore, eBay rules carry authority outside of eBay because they are so dominant in the used product industry.