When it comes down to it, a car is a car. Cars that drive better, handle better, stop better and are faster should be worth more than a car that drives worse, handles worse, stops worse, and is slower.
If someone wants to buy a car that says "hey everybody! Look at me!" (the epitome of a "viper guy") then yes, it makes sense that they would pay $1 million for a piece of crap car so they would be member of a select crew of piece of crap car owners, that everyone wants to be a member of, but a lack of supply means they can't.
Old Mopars (and most old, stock restored muscle cars) are Rice for old guys. All looks with nothing to back it up. We Rip on a dufus in fart pipe hondas, but he didn't pay $200K for a "muscle car" that would get his ass kicked on the street by the kid in the fart pipe Honda.
I'm glad Musclecar prices have gone into the stratosphere. The guys who put their blood and sweat into a restoration can get some of their time and money out of it and there's another rich guy who will be out on the street, just waiting for one of us to hand his ass to him.