I noticed that used copies of my latest book The Great Paradox of Science are available on eBay at about $10 higher than the list price set by the publisher and about $15 higher that the discounted price set by major retailers.
Since my book is readily available, why would anyone try to sell a used copy at a higher price than a new one?
I have never used eBay. Is there some weird marketing strategy that people use on that platform that I am unaware of?