My thoughts on this one..

I'll agree that the blue is a rare color and it's actually one of my favorites however with those Skylark fenders on there, this leads me to believe that either this is a repaint in which we neither know what is under the paint or if this is the original color. The fact that those fenders are on there could mean that the originals were rusted out or that they were replaced due to collision or maybe even that this car is actually a Skylark with GS added parts (who knows).
Look at all the other parts that it would take to make this car right (rims, fender vents, etc). I like the prices he shows for GS's however we all know that those are insurance or dealer prices and that those all assume that the car is complete but in various conditions. If I could get $35k for each of my cars, they'd all be gone (including the convertible) and I'd simply go out and buy more and invest the extra cash into some bonds.

The $55k he's talking about I assume was for the "Then & Now" convertible that went through Barrett Jackson a couple of years ago. That was when the market was at a high level and during a premium auction with many buyer with cash. This has obviously changed since then (not that it won't come back someday) and the car in question was a fully restored low mileage convertible.
http://65gs.com/GS_Gallery2/thumbnaere s.php?album=4&page=7
There is an old saying about buying cars and houses as investments "Find needy sellers and not needy purchases".
I think that we can all agree that for this one, this is a pretty needy car at that price and someone would really need to buy it with their heart to make any sense anywhere near that price.
Later,
Chris