Don't confuse those who post here only a "for sale" ad and those who are more of the enthusiast-type. Generally speaking, some Tesla buyers are (a) enthusiasts like us; some are (b) luxury buyers coming from MB, BMW, Audi, etc.; some are (c) bleeding edge types; and some are (d) "look at my fancy, posh item" buyers.
- (a) is more educated on Tesla specifically, and research all the available options and details before purchasing. They will have realistic selling prices
- (b) is used to high-end vehicle depreciation and will will have realistic selling prices (though are also accustomed to just trading in too)
- (c) these people are worrisome. If they don't overlap into (a) or (b), they are people who bought were cars were scare, where you had to wait for months and months to get the car, and the car was very novel. Until recently, these people were the ones who may have had to wait like crazy to get the car, or pay above asking from someone else just to get the car. They are unlikely to have realistic prices as they are accustomed to the "seller is king" mentality form when Tesla produced far fewer cars and did not have a CPO program
- (d) these people are also worrisome. They either (i) have enough discretionary spend and don't generally car about money. They are likely to always buy the Sig, P85+, and P85D cars and trade up as soon as the newer, better model is out. They will have decent prices are they are more focused on getting out of their current car more than anything else, regardless of whether it's the most financially prudent move. Or (ii), they stretched to buy the Tesla, having never bought such an expensive car (or only leased beforehand - remember that Tesla personal leases are only about a year old - business only before that) and have completely unrealistic expectations of their cars worth. These people will have their cars sit and languish unless they find other (d) - (ii) people who can't afford new or don't know any better.
And that is my explanation for some of the seller prices you are seeing.