I wonder if the dumb asses realize that many of the 70 Challengers and 69 Roadrunners have already been built..Darts,Dusters, and Demons are the next ones to be built.
Ya gotta look at it like this:
What's the average age of members on this site?
The market for fixing up these cars using AMD prices falls into a neat little category thusly: Those that are old enough to have expendable income to buy these parts,
and those that are young enough to have the energy, will-power, and life-span to fix up these cars. The intersection of these two is typically 45-65, thanks to having kids and all that, but this value doesn't change. It's about the same for most people.
Now, cross that with the age section of the population that actually, seriously cares about these cars. The bulk of that is in the 65+ market, meaning those that grew up with them and drove them new. This number is not fixed. People get older, high school girls stay the same age.
Notice: The group of people that actually cares is (and always has been) creeping toward the high end of people that have enough energy, time, money, and life to replace a quarter panel and get a car painted.
The value of these cars is beginning to decline because the people with enough money to fix them are the kids that just inherited that money from dead people that actually cared when they were alive. AMD knows this. All the aftermarket parts companies know this. Factor in that it's a limited market anyway (Damn, how many people are going to restore 1975 Valiant 4-doors, anyway?) with cars that are now pushing fifty years old (1970), and it gets tighter, and tighter.
After all, if you bought one new just out of high school (before you got drafted for 'Nam), how old are you now? My math puts you in the 68+ age range......and probably getting tired of fixing crap. You go cut that quarter off today, how long before you're road-worthy and lookin' sharp in that car again? 6 months? A year? That year is the difference between a lot of Harley riders and Ghost riders, these days.
Put another way, the cars are aging out, and if they don't, the enthusiasts are.
Look at Harley sales from 1970-2018 and you'll see that it mirrors this trend a little too well.