Maybe every car that sells, should just be listed as 1968 Camaro, or 1967 Camaro, and then let the buyers figure out what it is worth. No pre- estimates.
No SS, Z/28, COPO, Yenko, no extra description, just "1968 Camaro" period. Make the buyers research, or seek the opinion of an expert, instead of the auctioneer, or the seller for insight on the car.
I know this is just the opposite of all the labels thrown out there, but I think it would cut down the misrepresentation , and over bidding.
I remember back in the day where you could call about a car like a 66 Chevelle, and then get there and it was a SS-396, or call about a 65 Mustang, and when you got there it was a 65 fastback. oh the good old days, of little info , and "come and take a look at it and see what you think"