i think this is true and something to think on.
if we're working in gorilla math, the comps don't bear this out as good price/starting point. but, then again that's never really a consideration with most of us...
for example here's a 65 S in what appears to be very clean original condition:
1965 Barracuda formula S - cars & trucks - by owner - vehicle...
yes, it's more than double the price; but i don't think that you could get to this from that for 12K or so.
locally, an absolutely beautiful 66 S car sold for mid 20's. the interior was immaculate, the paint was maybe a 10yr old respray that was very presentable and professionally done. motor was correct commando with an *slightly* upgraded solid from oregon cams everything else was period correct externally with the exception of 340 manifolds, factory electronic ignition and a clutch fan. the brakes were upgraded to dual master cylinder and wilwood calipers, and it had an 8.75 3.23 SG out back. the steelies were custom 14X6 and it was still SBP, front end and trans had been gone thru about the same time as paint, but not much mileage and every was tight and solid.
everything on this car was clean, correct and upgrades were subtle and thoughtful. you could get in it and drive across the country tomorrow if you so chose. it's something like this that i would weigh my decision of purchase price on.
unless it
has to be a formula S 4spd car and you're going the resto route, or it's one of your bucket list forever cars, i think there are better and cheaper deals out there.