They have no financial interest in protecting buyers. The Ebay ratings system has loopholes. Although the instructions on how to use the ratings system are included at the close of every auction, sellers are not obligated to follow the sequence. Sellers are supposed to report on how well a buyer met their responsibilities immediately after the item is shipped. This notifies the buyer that they have met their responsibilities to pay promptly and serves as an acknowledgment of payment, with notice that the item is shipped.
Buyers report on satisfaction when the article is received, thereby also acknowledging receipt.
Disreputable sellers can often not report feedback until after a buyer reports. This goes un-noticed with positive transaction typically, unless a buyer has a complaint. Even after escalating the issue to management, Safe Harbor would not consider this or any other adjustment to the process to prevent this form feedback extortion. Most likely, they have too much to do just keeping firearms, submarines, refugee rafts and body parts off the listings. Sellers can arbitrarily refuse to complete a transaction with a buyer.