A reserve, or starting at an unreasonable high price is a ploy, and has nothing to do with selling.
Had a brief conversation, a few years back, with a car seller who was doing that. He did it strictly for the leads it provided.
Then there are the ordinary "I know what it is worth" and want high retail in a wholesale environment.
Like Femme says, "listers".
A few years back we even gave a name for that sort of person, on Motors Board in the US, "Elias". Elias, not his eBay ID, had a wrecked BMW, lying in weeds, beat to snot. His "I know what it is worth" price was ten times the actual value.
.
.
.