Why are Superbirds worth so much?

Thanks to member here I got to sit in that real nice yellow one he posted(limelite70)
I also have been in that white one that Matthon posted the rear quarter of.
And I have been in a orange 440/6 4spd that a friend sold a couple of years ago.
I still remember a white one that ran around my home town when I was a young Clown,they had their own appeal to some and no appeal to others.
I can't afford one and probably would never own one(not my style)But I will agree that when one is driving by you on the road it gets your attention.