Agreed...I didn't buy my Z so I could sell it later, I bought it because the price was right, there's a sizable aftermarket, parts are(or were) cheap, it was well-made and got good gas mileage.
Zs started life as affordable sports cars, I'd hate to think they're going to start commanding high prices(although we'll probably see it soon, just as InitialD made the AE86 Corolla a collector's item, Wangan Midnight looks poised to do the same thing to the Z).
And aux, the car you posted MIGHT be worth 3/4 what he's asking, but you know better than I do. I had some guy tell me my car was worth 5 grand not too long ago, I had to resist the temptation to laugh.