Then how about this..... it sold recently:
2007 911 Carrera S Coupe 6 spd
I realize it's apples to a different kind of apple, but it sold for about the same as that 52K mile 1985 Carrera on eBay.
All because it had 99K miles. Condition was exceptional. New Pirellis. New windshield. Stacks of receipts, dealer maintained. No paintwork. One owner.
Three weeks ago the same car (but without NAV) did $58,200 with fees. Because it had 13K miles.
A $30,000 premium for fewer miles.