"Muscle Cars" (and don't call a mustang or camaro a musclecar, lol) were really cheap for many, many years and finally went up and then thru the roof a few years ago...Takes time for a car to appreciate and while I don't think these will ever acheive that sort of success, they will not go down either, unless something happens to them (hacked, crashed, parted out, etc.). It is a shame that they don't get much $, but give it time.
Now, I think the price is insane for this one, but that is just me...Good luck with the sale, at any rate.