They could also brick it remotely, or introduce a bug in the autopilot and plow you into a barrier: You might not want the upgrades

Ok, but if the E Class worth went up, you can't really say that's a bad deal...

They're classic cars from the 1950s kept shining and running. Not only did keeping them that way probably cost quite a bit, as I'd bet an E Class sold today won't have the same appeal sixty years from now as these do today.