I don't think the average Tesla owner cares about "cheaper to operate". I have a weird feeling the average Tesla owner has a classic, gas guzzling, vechicle/vechicles in their multi-unit garage.
Teslas are a rich man's car.
I'm waiting for the day it becomes a poor/middle class vechicle.
I know I won't buy a used one until they open up the parts supply, and open up the operating system. I don't see that day coming. I really wanted one a year ago. I figured they must have a few that have been wrecked. I wanted to put one back on the road, with a salvage title. I found it's practically impossible.
As to holding their value, yes--they are commanding high prices, even used. They are a rich man's novelty. If a rich man can get deal on a used car, why not pay bite. It's a small demographic sector of society. It's a niche market right now.
My hope is in the future all electric vechicle manufactures are required to open up their software, so guys like myself can buy in the secondary market, tweak, and get these used electric cars back on the road, in a cost effective way.
(Dissabled the AI if you think if the Tesla, or federal government fears guys, like myself, will tinkering with it. I can live without the AI. I do want a cheap, used, electric vechicle.)