I own a GN as well as the my TTA,bought the TTA back in Feb this year,100% stock orig,paint,exhaust,all except tires,15k miles.Have only put on 300 miles on it.I love low mile,orig survivor type cars,but as far as the TTA,I actually enjoy driving my GN better for the reasons being,it is an 80k mile car,I already painted it,have mods done to it(high 11 sec-12.00 car),so blows away my stock TTA as far as power goes,and more comfortable of a ride.
Don't want to rack the miles up on the TTA,and want to keep the stone chips away from it.It is a double edge sword,would love to drive it more,but being one of the mint low mile examples,resist driving .Sometimes I wish I bought a 40k up mile one so I would'nt feel bad about putting 1k a year on.
Saying it in a weird way,I love looking at it more than driving it !!A quick drive around town,10 miles or so,is what I have done with it.
As far as value,you should be in the hobby for the love of it,not the resale.