Have collector car prices dropped significantly in the last couple of years???

Watching Barret Jackson where they are in CT on television and prices are down. A 71 Hemi Challenger, and 70 Hemi Cuda didn't make reserve. They bid to about 150k. I think over all prices are a bit down except the people who think they have gold, or are in way over their head in restoration or parts and are trying to get their money back. I have seen an uptick on cheap Muscle like Dusters, Novas and things as most Big Block cars went to almost unobtainable in more than they are worth. A well restored car will always bring in much more than an average or below average resto as well.