Just don't get it with some sellers

[Snapolit1]

Maybe someone could explain to me the logic behind this.
Let's assume a fairly obscure but not impossible to find card. From the 1920s. The last 3 sales on eBay were in the neighborhood of $700-800 for the card Authentic. Now there are 4 cards listed, all As, all about the same. 3 of them are appx. $850, but accept offers. The 4th is listed for $1800. Same condition.

I realize some people really don't want to sell a card, and list it at some dream price in case lightning strikes. The "I don't want to see my house but if someone rings the bell and offers me a million dollars for it of course it's for sale" routine.

But why take the time and expense of listing some for 2x what three or four other people are selling for? What are hoping for. It's just going to sit right? And the seller in the case I ran into last week was a sophisticated seller, someone whose name has been bandied about here in the past. I just don't see the plan with this kind of listing.