My dad bought one of the yellow 35th anniversary 350z with incredibly low klms (about 2 or 3k I think?). He loves it to bits and is maintaining it so that he can hand down a low klm 350z to me someday. I keep telling him it won't be worth anything so he should just drive it and enjoy it now, but he said he does love it and it just makes it special when he takes it out for the odd sunday drive here and there.
Perhaps there will be some value in an "original" low klm 350z as many have crazy body kits and get modded etc. but I don't expect it will ever be worth more than what he paid for it. I think the shape of the actual design has a big part to play, as it has to date well. The fact that the 350z doesn't look like every other car on the road will help, but that doesn't mean it will still look good in 10,20 or 30 years. However I still look forward to the day that I get an umolestered pearl yellow 350z with less then 50 000 klms on it.
With all things "retro" you need a certain amount of time to pass to appreciate them again. I think boxy cars from the 80's are just starting to look kind of cool again whereas I couldn't stand the look of the z31 when I first got my 260z. However I believe the point about popular or dream cars from peoples youth are the ones that become the collectible cars once that generation matures, and then I guess they lose value once that generation gets on. I am always surprised at how cheap restored cars are from the 1920's-1950's. But then again you have some of the mercs and Aston martins and BMW's that are worth hundreds of thousands. It seems that most of these are tied to either the scarcity of them and/or the racing pedigree behind them.
I suppose things like the r32/33/34 skylines will become a collectable as they have that kind of 'legend' status in peoples mind for whatever reason. I personally don't like the look of them and never have. But I think they have that tough, almost myth like reputation that people will want to relive one day. Again trying to find one that hasn't been horrifically modified will probably help increase the price of them.
For me, I don't ever plan to sell my 240z, I've heard far too many stories of regret for that to happen.
Oh yeah i've been busted by my mum thats much worse. I slammed the door on her as she came in unannounced. The door hit her face so she started yelling and crying, so I yelled "f*** off im masturbating!"
We laugh about it now, for my last birthday she gave me a card that said "every time you masturbate, god kills a kitten"
Hahahaha that is by far the best post ever on this forum. We need to do yearly awards or something

