The big secret is that these cars are indeed going up in value. It may depend on what part of the country you are in. There is a real "thing" going on right now with making restomods out of GM colonnade cars, and these late B's. I sold my 77 cordoba 3 years ago much quicker than I thought I would...and I realize now I could have gotten more for it. I now have a 75 fury sport (roadrunner lookalike) which gets unsolicited offers to buy everytime it is out (this body style is really hot due to its uniqueness and smaller, more trim appearance - it doesn't have the garishness of the Doba and looks more muscle car than personal luxury). Twelve years ago I had a 73 charger and 73 Satellite...I barely got rid of them for what I wanted out of them...now they would be worth several times more than what I got for them. 71-74 B bodies at one time were not that desirable...neither were the 71-75 A bodies..that has all changed. So it will be with our cars as well.
And I agree with the comment that one person made on this thread, that we give these cars a much harder time than the general public does. Park your Doba or Magnum out on a busy street for a day and see how many admirers and would-be owners come knocking. Its not a 68 Charger or 71 Cuda', but honestly, WE'RE the only ones who really worry about that.