They talked about this last year on one of the Barret-Jackson auctions auctions I was watching What they said was that as time goes by their customers are changing and they have had to adjust their catalog as a result. Basically what they said is that many the people who spent the big money on 60s-earlly 70s muscle car were people who wanted those cars when they were kids and teenagers in the late 50's to early 70s but could not afford them or they did have them they had to get rid of them for whatever reason. These same people became wealthy in the '90s and 2000s and began buying those cars driving up the value.
So now the next generation of car guys who were kids and teenagers in the late 70's to 90s are showing up with money looking to buy the cars of their youth that they could never have. Driving up those values.