Jason,
You seem to miss the whole point. A private owner can ask anything they want for any car but its the sales prices that counts.
I can find ads in many places where people will run high and low prices. Most people who own cars like this want more than they are worth anyway. I am not saying they should not get what they ask, I am saying that when the money changes hands is the green that hits the palm is the only thing that counts.
Dealers control these these markets and they do not want to pay out any more than they have too. Its a business withe them. It pride to an owner! The majority car transactions take place through a dealer than through private sales. That is why they can set the standard and the reminder of the industry follows.
As I mentioned, The LT4 series along with the ZR1 and Callaway cars are all in the same boat. Checkout these car sales for trade in's and you will see that they are actually taking a greater beating than the GS/CE.
By the way, in the Atlanta Journal Classified section there is a 2002 Z06 with 1k mileage for sale through a dealer at 43k. That's cheap!
Like I said, look at the wholesale market to led the way in pricing, not the private sector.
Stan