My first thought was, "Is the seller a dentist?" It doesn't appear that the seller is a dentist but it does appear that the seller offers a large assortment of merchandise, much of it priced at the high end of value. Some lots seemed to be priced within reason while others were steep; what you would expect at a fancy antique shop in a swanky tourist town. Consequently, it can be difficult to know whether something is genuinely rare and highly sought after, priced at an extreme because the clientele has money and thinks that if it is expensive it must be genuinely rare and highly sought after, or just plain fake and the owner believes in, "go big or go home!" Often the seller will indicate that they are just listing an item using what the consignor told them. In a venue like eBay when the seller has hundreds of listings this might be believable, but if the seller is making a commission on the sale it will benefit them to turn a blind eye.
Ultimately on an eBay site like this one (or anyone for that matter) it's "caveat emptor" and don't spend more than you can afford to lose.