You are dealing in a "desire" market as opposed to a necessity market with these cars. In such a market the cars are worth whatever someone will pay for them.
Like the nut-jobs trying to get $140k for a Supersnake, or the equally crazy guy selling his terminator for $16k because he has no patience to wait for a buyer.
Every car has a buyer, if you can afford to wait, do so.
Every car does not have a buyer. I have seen for sale threads that last 9 months and the seller gives up. I have a "one month" rule. If priced properly, the car should sell within a month. The KB Mystichrome sold in days. That was priced low at 20k. My most recent car sold in two months. I probably was asking a bit much at first, then when I dropped the price 1k, it sold right away.
There are buyers and there are sellers. The two meet when the price is right.