I think people are more preservation concious & in order to keep their car's on
the road (Practically) you have to do a stripdown restoration to get longevity
out of your Z.
I gave up on concour's & nut & bolt replacement years ago,
after spending ten grand on a build-up,& then wrapping it around a tree!
( I still have that tree ).
Nowadays,I have made it presentable,both mechanically & asthethically
& thats good enough for me. DJZ 60.