Its a Nissan, there are lots of them, and people pay what's its worth, not what a forum dictates. You can price it for 30k if you like, but there are so many not on the club, that people will just buy else where.
TVR are a rarer brand, carry more prestige, no longer exisit, are more exotic and collectable. the down side of jap cars is they built them in vast numbers, and at a cheaper price than competitors. great when they are new, but you have to wait a hell of a lot longer for them to become collectable and go up in price.
look at the 240Z as possibly your best example of what islikely to happen to the 350, and that will give you a good time line.