I live in California and i STILL dont see too many 370's... I bought mine in '09, i DO see more than i used too though. I think i figured out why though. I think its because the Z is a car that appeals to a certain type of person... If that person is a younger person, they will have to be doing pretty good to be able to afford the car AND the insurance.. and not have a small child.... its possible but IMHO, the Z wouldn't be a practical choice for that person.
Then you have the older person that knows and LOVES the Z's heritage. (like ME, lol) I'm 48 with NO kids in the house, been driving almost 30 years and can afford the insurance for a Sports Car, the car, a Mortage,yada, yada.
To my knowledge, the Z wasn't leased was it?... everyone I've discussed this with is purchasing their Z. THAT could be the key also.