Yeah, and I don't know why. The trucks themselves are still easy to find in nice unrestored condition for cheap.
Bought my current 79 1-ton several years back, low miles, original paint and all, and still a very clean looking old big block truck. Didn't pay much more for it than some of the NOS parts are going for
I still see nice original trucks out there for a little more than I paid, but they are out there. Much better bargain than buying a basket case and trying to restore it judging by some of the prices for NOS parts
But hey, I'm not complaining. If someone wants to pay a ridiculous price for my truck I'd sell it. Everything is forsale for a price