Ditto, I sold a 955 mile for $33.500, and a 37 mile in plastic for $32,000... considering the pair were bought new at Conley in 87 for $32K...it was a strong investment for a car (not by Real Estate standards though) The GNX we had was sold at high market 12 months ago, which is low market now.
If you say it only a blah blah blah GNX is ONLY.... you just dont get it. Its not the car is that great, (I believe they are pretty awesome) its that buyers think it is. We ALL know any t-type w/ a TA49 and a lil boost will walk a GNX, but the point is OEM speed, availability, and the low build #s. It baffles me the haters against what is the ONLY 80s muscle car, and the REAL beginning of turbo HIGH perf in America from an OEM level....AND its a Buick.
Realizing the GNX surge, it WILL trickle all the way down. If the GNX was a $10K car today vs $100K....your 84 Gn would be a $500 car, and a 87 would never break $5k. Be happy the GNX is holding/gaining value, it may never be affordable, but your GN may get "unaffordable" for some, and that will bring us all $ if we ever sell. ESPECIALLY the unmolested ones.
The point is very few car Appreciate, we are in them weather its GNX or GN... close to stock cars are really solid investments, and more fun to drive than a big piece of dirt in a neighboring county.