Pat,
I respectfully disagree, for a few reasons.
The reason Hemis go for six-figures has nothing to do with quality. It has everything to do with desirability, which is based on perceived performance advantage over its contemporaries. Sure, better restored cars carry a premium, but with muscle cars, it's about the right hi-po engine/carb setup with the right options list checkboxes.
And it's not even about rarity. They only made 252 three-speed Corvettes in 1969, but the 2722 427/435hp tripower cars are all worth a heck of a lot more. Or for a better example -- 1964 Buick Rivieras were high quality, better riding, often better performing, and most importantly --rarer cars than Impalas, but it seems that these days you can't sell a Riv if your life depended on it, while the '64 Impala SSs are still highly desired.
Now as for restoration -- Concours, actually, is not "concours" across the board. What constitutes 100point is really a breathing concept. For instance, NCRS standards often are in conflict with Pebble Beach standards. Furthermore, CCCA concours judging is different than both the others. There were cars in the high 90-point range at our regional CCCA Grand Classic, which under NCRS-esque or Pebble Beach scale grading would have scored in the low 80s. It's a question of authenticity/ period correctness/ factory correctness vs. restoration quality.
My TR3, for instance, was inspected by the mechanic who sold/serviced it new (yeah, can you believe that!!! I bought the car in Santa Rosa, CA a couple years ago, and the Wine Country-area dealer sales/service manager moved to Olympia, where he now works on old European cars!) He said "this car looks a heck of a lot better than it ever did new," and noted which typical TR3 deficiencies had been solved on my car. Now my car would score mid 80s at a concours on a Pebble Beach system -- and it wouldn't stand a chance against most the TR3 concours cars here in the Northwest -- which are restored to levels often on par with the Dusenbergs and Mercedes 540Ks in my area.
And I don't dispute that TR3s do, in fact, go for more than $15K, just that the "average" price for a concours steel disc wheel, non-OD, no hardtop car is roughly $15,500. The average concours price for a desirable ww/od/ht car is roughly $19,000.
There will always be blank check purchases, but in the industry, we must focus on the majority -- rather than the guys like my father in law who always pay way too much, and the guys like me who never buy a car unless it's a near once-in-a-lifetime deal. (Other than the '02 Corvette in my garage and my wife's Olds -- both bought new, I have yet to spend five-figures on a car, including purchase and running costs.)