I used to have a 1990 BMW E30 M3 when I was about 22. Back then you could get them for 10-15k tops, and I got mine for 12k.
It was in damn near mint condition, and it was a cool car. Fast forward to today and people are paying well over 70k for them. I'm left scratching my head. I owned that car for a while. Was it cool? Sure, it looked very "DTM", and classic. Was it fast? Not even close. It handled reasonably well, but it was just an underpowered 4 cylinder engine, nothing special by any means.
So every time I see one selling for over 70k, I sort of scratch my head and just say to myself, "Wow, the car was cool, but it wasn't that cool!".
For 70k I'd go out and buy a used Vette or something if I really wanted a fun car.
Of course for a lot of these people, nostalgia is worth paying more for. Part of me gets it. I had a 1969 Camaro SS and a 2013 Camaro SS. The 2013 was better in every way imaginable, and far better to drive. Of course the 1969 was undoubtedly classic and much better looking. I guess it just depends on what you want.