Exclusivity. I very rarely see another 370Z around here. I can count on 2 hands how many others I've seen since I bought mine in Nov '09
Chicks love the car
You *must* enjoy being stared at. Don't buy a 370Z if that would annoy you
Since the sales volume has remained small due to the economy, value of used Z's is holding up nicely.
Cars with actual manual trans with - gasp - stick shifts will vanish very soon. You will be an exclusive member of the Man's Man Club
As someone else stated, get a beater car for the winter. Especially in the Dakotas.