Once dishonest sellers realized that ebay was monitoring below market value items they would simply raise the price so that they wouldn't be flagged. Perhaps they wouldn't sell as many but they would still be here. I understand what you are saying and I agree that counterfeits on the site are a problem. But I'm not sure what the solution is.
Buyers do have to take some accountability too. If they see silver for 4 ounces at just over spot price with free shipping, they should be suspicious. A well know US site is selling 4 - 1 oz Eagles for around $190. This seller was asking $108. Do people think that a US coin costs less in China? If something is too good to be true, it likely isn't true.
At least eBay does give the buyer the option to get their money back by returning the item. Ebay doesn't have the manpower or knowledge to know for sure if an item is counterfeit or not so they do just say to return the item. In this case it is very unlikely that the seller in China is going to send a buyer $50+ dollars so that they can send the coin back with tracking. If they don't do that the buyer can contact ebay's customer service on Facebook who can force the seller to refund without a return. Perhaps you don't care about the money but at the very least try to force a return so that the seller doesn't walk away with it.
