From what I’ve seen, the >17yr old imports aren’t to save money, but your chance to finally drive something exotic that wasn’t (or wouldn’t) be approved for sale here. E.g. RHD, Kei cars, Nissan Skylines
As someone passively enthusiast about cars, I think that's in general a good thing. People buying classic/old cars generally know it's not going to have current safety regulations, but may still appreciate it and take the risks.
I'm font on retro/rust-mods where they're updated with modern engines, controls, etc... others prefer completely stock/original as possible. In the end, it's not so different from being able to maintain a listed building in England or other heritage or historical works, other than it rolls down the roads.