70 duster 340 4 spd cars were never worth 20 k along time ago too. You used to be able to buy them just about anywhere for $500.
Times have changed. Like it or not, or in your case - believe it or not, Later generation cars are drawing more and more attention and commanding higher dollars than they used to, just like the ever so sought after 69-71 cars that some people believe are the only cars worth anything.