Rarity?

That word "rare" means a lot of different things.

There's "rare" as in "This is one of only three '70 Dart GT hardtops painted Plum Crazy and equipped with the ashtray light package (…and that's why it's worth $38,999 although even the windows and seat foam are rusted out, let alone the actual body metal)".

There's "rare" as in "Wow, man, that's a super rare car! I know because my dad's cousin's stepbrother's boss had one, a '69 Lancer 880 9-passenger 2-door station wagon. Had a 383 Hemi with a 4-on-the-tree and factory A/C."

There's "rare" as in the opposite of "well done" (which can apply to cars or steaks)

Then there's "rare" as in statistically, 1968 Barracudas no longer exist at all, so no matter what engine, transmission, brake package, paint color, etc…at any given moment, unless you're at a car show, you're not likely to see another one soon.