Yes, I agree.
If you are talking about Turbo Buicks, it is true. They are all, if not already, approching 20yrs old. They will officially be 'collectors items' and that's why sellers want the money and will wait to get it.
Other used cars are getting pricy because the cost of a new one is rediculous. People are willing to risk buying a used one with or without a warranty just because they can't (or don't want to) afford it.