[Mr70]

I think it's because alone,they're both a great piece of Americana by themselves.Together they align & can bring others to pay that kind of money.
This particular type of car,plus Bruce owning it = transcends the norm.
If Bruce owned a yellow Triumph TR7 back then instead and it had a pencil in the glovebox with his teeth marks on it,it wouldn't get 1/5th this price.
..are you listening Jon Voight.