Even the most benign, 4 door, stated as "no rust" car (that is covered with at least surface rust), that has dents, broken glass, a tattered interior, either a bad engine/trans or none at all, flat tires and often no title seems to start at a $4,000 listing price. I think people see a $150,000 Road Runner sell to an inebriated Barrett Jackson buyer who had just inherited from their deceased parent..., and thinks their 4 door Plymouth Satellite looks enough like the Road Runner that it HAS to be worth at least 5% of the value. Yet it wasn't that long ago that was a sub $500 Satellite. Years ago no one would touch a 4 door 55-57 Chevy. Now the worse of those go for a $15,000 asking price.
So, reckless spending by foolish (momentarily wealthy) buyers set a high bar and misinformed people price their similar "junk" reflected off those prices. My experience is those cars sit FOREVER and never sell as the seller is too stubborn to price the car reasonably. The sad thing is others seen the over inflated price and think theirs is worth that too. If we haven't hit the peak, it is probably coming soon. The next generation is "Green" and old polluting, gas guzzling cars are not their desire. Some Millennial will probably sell his deceased grandfather's Hemi Cuda for $20,000 to but a mint, 1st generation collector I-Phone.