This has nothing to do with UX. Yes, eBay has a terrible UX but some people have stuff to sell and no time on their hands.
Does Instamotor exist because of the terrible UX of car dealerships?
Does Instamotor exist because of the terrible UX of car dealerships?
The quality of ebay's UX is the main determinant of how much time you need to have on your hands to sell something on ebay.
>Does Instamotor exist because of the terrible UX of car dealerships?
Yes.