I don't understand why the Family would be angry at a getting that much money for a car that was beat to the ground (and still looks like it was beat to the ground and then some) but I guess it's just basic greedy instinct to want more! It's Crazy that it went for this much just because of it's history!
What does a restored Hemi Challenger/Cuda go for? I ask because I'd rather have something that didn't need the amount of work that the OG BG needs to just make it nice and then once you'd restore it, it might lose some value. Who knows in this market?
I don't know nor have I read up much on them. But I did watch that documentary and a couple interviews with the owner. I get the idea that they are not a family of means. When the car was "rediscovered" back in 2016, they sought to repair it and get it running again. They ended up only doing a minor mechanical repair to get it running and did some basic repairs to make it driveable. It hasn't been touched since.
We all know it's a rotting car at this point. There's a gaping hole in the floor, it leaked for days all over the national mall (oil and coolant). It's got extensive body damage on the driver's side and lots of undercarriage rot and rust. For a car with this kind of history, it needs a concourse restoration. Any other lesser restoration would destroy this car's value. Even a general restoration would cost 60-80k. This family seemingly didn't have the funds to pull off the resto. They held on to it because I don't believe they wanted to sell it... but as time went on, it just kept rotting. The more it rots, the more expensive the repair bill.
I'm pretty certain that Dodge's marketing people had something to do with pushing them to sell it to coincide with the last call editions and their release date. They probably paid them a handsome sum to use the car for promos and to back-channel aid them in marketing it for sale. This way, the car help's Dodge while also freeing up the problem with having a rotten car that's too expensive to fix.
I'm in the same boat with my factory original '67 GT500. I'm fortunate in that it is stored in near pristine condition. However, if something happened and I had to whip out $100,000 to repair or restore it, I wouldn't be able to do that easily. I've said it here before, owning a valuable classic is 1 part blessing, 2 parts curse. If something goes wrong with it, you usually can't take it somewhere to get it fixed. You either have to do it yourself or find a specialist. Like, if I ever get a paint blemish... I can't buff or touch it up. It's factory original lacquer paint. I know how to work with lacquer, but on that car, I don't trust myself. I'd send it off to someone who knows how to blend it properly without adding any new paint. Having any amount of repaint on that car would force a 20% loss in value. The same is true for all the mechanical parts. You can't just put generic parts on it, at all. Everything has to be new old stock, or you have to repair the broken piece itself and reuse it. Anything short of that and half my value goes away. Something as simple as replacing a brake master cylinder becomes a very expensive undertaking when you can't get a NOS part and have to find someone or a company to refurb your existing master cylinder. I had a thermostat bolt break off in the block a few years ago. It cost me almost $1,000 to have that bolt carefully tapped and backed out... then repaired by a blacksmith via forge welding the head back onto the damned bolt.
That's the level of care that the Black Ghost is going to need for it to maintain top value. A resto of this grade is going to cost somewhere in the ballpark of a quarter million dollars. However, it would also spike the likely value well above $1.5 million. Right now it's valued at $975k in original, yet rotten status. Pristine and concourse restored, it wouldn't be original any longer, but it would be a concourse restored major 1 of 1 426 Hemi car. While it loses the original tag, it would better preserved for posterity and would be worth a lot more.
I've heard it said many times over, "Every original car eventually succumbs to time." At some point, that original nature becomes a value killer. When the rot gets too bad as to when it causes more damage than benefit... that's when you restore it. This owner couldn't afford to do the level of restoration this caliber of car demands... so they sold it. I'd do the same thing with my GT500 if push came to shove. I'd rather see it in someone's hands who could keep it alive, versus just rotting away in a dark corner in my garage.