I wouldn't shed a tear if eBay out of business. I stopped buying on eBay years ago, because 90% (not an exaggeration) of the stuff I bought was not as described, broken, or wasn't even delivered after payment was made. Didn't matter if it was an individual seller, or a small business. Even when I "had the goods" on him or her, eBay's "fraud service" would never investigate. I believe it's because they make their money from sellers, not buyers.
"Feedback" is a total joke. A lot of buyers are afraid to give bad feedback because the sellers hold them hostage, whitholding delivery of goods already paid for until the buyer places a good feedback. I've been slammed with a very malicious, dishonest feedback by a seller, just because I had the courage to tell the truth. He shipped me something totally inferior and a different model than what I purchased, and would not make good. I had canceled checks, pictures of the auction, hardcopy letters that proved my case. Did eBay even look? No.
Any bad feedback against a seller gets buried in the volume of sales sellers make. That's why checking someone's feedback is not necessarily going to protect you. Negative feedback impacts occasional buyers far more than sellers, because it's there for everyone to see.
Finally, why is it the buyer ALWAYS takes all the risk in a transaction? He has to pay FIRST before the seller ships. And if the seller goofs, sends the wrong goods, or does something dishonest, the buyer AGAIN has to take all the risk by sending the bad product back to him first. Chances are he will not see either his money or the product he bought.