Expensive car == expensive aftermarket, in my experience. Quality dampers like KW v3 (MPP) or Öhlins DFV (Redwood) are probably never dirt cheap, but there does seem to be a price premium for Tesla mods over similar/equivalent ones for cheaper cars I've owned. Nothing really surprising or unexpected there though...plus there's been enough inflation that my mental pricing for those old cars is probably out of date anyways.
Personally I'd be happy without height adjustment if it saved me money. I don't want to go lower at all, I just want better damping (with appropriately matched springs of course). But that option doesn't exist on the market either that I've seen, all the damper upgrades for the 3 and Y are height-adjustable coilovers.
No damping adjustment would be fine for me too if it's good out of the box, but I'm okay with 1 way adjustment because that should be fast and easy to dial in for my street use. Anything more than that would be an unnecessary amount of flexibility for me, I don't want multiple dimensions of settings to test, I'd rather the dampers come with a good balance between compression and rebound damping.