I agree with all of the above^^^ and as an eBay store owner wanted to provide:
eBay is set up so the customer is always happy. Sellers cannot leave negative feedback for non-paying buyers or for buyers that threaten them, etc. Buyers can open a case against a seller if they are dissatisfied in any way.
Once a case is open, if the seller doesn’t respond, ebay decides the case, usually in the buyers favor. This can mean a partial or full refund which included the shipping fees.
I have been buying & selling on eBay since 2001. I can still count precisely how many times I have needed to open a case against a seller. I purchase antiques, artwork and daily necessities. The most common issues I’ve run into are poor packing and lack of communication. Usually this occurs with less experienced sellers.
As a seller, I do not want a case open against me ever. It cost me money. EBay charges a ridiculous amount in fees for each listing and for my storefront. After “x” amount of cases it depends on volume of sales/items listed is open against a seller, eBay begins to charge more.
If you are anxious about purchasing antique pieces, then look for a Top Rated Seller badge and buy only from a seller that has one, until you have a few buys under your belt.