I think a lot of it is generational. Guys that are getting into their late 30s-40s that finally have the money for a hot rod do not know about the negative a body stigma from the 1970s-80s, they are just good looking muscle cars to them.
Same with AMC cars. The Javelin, AMX, etc. Younger guys don't see AMC as the red headed stepchild of the American auto industry the same way most older people would.
When it comes to muscle era Mopars, the A body stigma has always been a big joke to me. A, B, and E are all the same underneath; there's nothing radically different about any of them.