As I understand it, they just started selling the "fsd capable" stuff a few years ago. Are any of those cars nearing end of life? That would be an even greater cause for concern IMO.
To be fair, a lot of people right now would willingly pay $5k for the features that are available now, especially if they spend a lot of time on long highway trips.
The price keeps going up, though: if you bought it right now, it wouldn't be $5K, it'd be $10K. It's possible Tesla's driver assistance systems are better than anything else on the market in their current incarnation, but that's getting to be a pretty big ask.
I'd be surprised, I've heard (and can not immediately substantiate) that they are generally very reliable vehicles. I guess part of it is that they just don't have as many mechanical points of failure.