4Runners hold their value well, but people are bonkers.
These two examples aren't that great for the reasons mentioned. 1st one no hardtop, has V6 engine, "no rust" yet shows obvious rust. It's not unique enough at this stage of the 1st gen appreciation, though those could also go up as years progress. 2nd one has a mismatched interior color, primary being brown which is a nightmare. I could see $5k or $6k on that one though.
Why I bring this up is I'm currently trying to restore an 1985 and it's expensive to restore these correctly. Especially with the 1985's, a lot of the parts have been discontinued and aftermarkets may not even exist. So to find these parts in a decent condition used/junkyard is also tough. Interior parts are a whole different story. I don't if I'll ever find a new brown manual shift surround console ...
So for people complaining about mid-teen's for a 1st gen 4runner, I think they're just going to go higher. Rust and trail-use has eliminated a large stock of used parts and good foundations to start with. I see lots of rusty ones starting at $3k where it would require another $5k in body and paint work just to get it looking decent. And that's not even talking about rusty bolts, brackets, etc that need to be dealt with and mechanical issues.
With the new Jeep Gladiator which the 1st gen is pseudo-similar to with a top off functionality and bed, and the huge surge in 5th gen 4runners (I see them everywhere, mostly bro-dozers), possible return of the Ford Bronco, there's going to come a time shortly where these will command those prices and higher as people want to appear "classic." I can especially see this in the 5th gen crowd where they want to appear more legit by going after an old 1st gen to add to their stable.
Personally, I think it's ridiculous to pay $50k+ for a 5th gen 4runner that has all the character of a loaf of Wonder bread, even with "cement" paint. I'd rather pay $25k for a perfectly sorted OEM 1st gen 4runner, say with a navigation upgrade, maybe some heated seats, than more than twice that for a brand new one.
Don't mean to rant, but this whole "every 1st gen 4runner should be cheap" and "how dare they charge that" is exactly how those conversations start before an upswing on other modern classics that skyrocket in value.