I think alot of the z sellers are on crack. I saw one on ebay a couple of weeks ago for $27,000 with a hideous "$20,000" paint job and I about died laughing.
Quick story; I saw a Z at a small hole-in-the-wall dealership for sale. So, I stopped in to look at it. The paint was peeling and 1/4" thick pieces of body filler were falling off from the poor bodywork, the bumpers were dented and sagging, the floor looked like swiss-cheese, the tires were balled, it had three different wheels on it, the interior looked like a grizzly bear and a puma were mating in it, the dash was torn to shreds, the car sat lopsided, and it didn't have the original engine or transmission.
I went inside to ask how much it was. I was expecting somewhere around $800-$1000. The guy told me $3900! I looked at him and said, "Would you take $600?" The guy got red in the face and said, "Get out of here you idiot." I responded, "There certainly is an idiot here, but it sure as hell isn't me."
A few weeks go by when I'm at a restaurant and what should pull up? Sure enough, someone bought the car. I saw the guy and said, "So you bought that car, huh?" I asked the guy how much he paid for it, and he told me he got a deal on it for $3700! I started to grin, and explained to the guy about the value of Z's and what not, and the guy got pissed and started yelling about how he was going to sue the dealership. Of course we all know, the guy was SOL.
Anywho, that's my story of how stupid unknowledgeable sellers can be.