Kirby said:
I should have said long term appreciation. I believe that they are dropping now, but in general, high end, unique cars with low production runs generally increase in value over the 10 - 30 year period. I like to watch the Classic/Antique Auctions that are on Speed and other cable channels ocasionally. Some production cars from the 60s like Camaro RS, Mustang GT500, Stingrays, etc. sell for 10x to 30x what they cost new. I think the M Coupe will ultimately be there.
I would expect the same for your NSX?
I certainly hope so. Right now the 91-94 NSXes are holding steady, which means they are depreciating at a rate equal to inflation.
As long as people continue to appreciate cars like the M Coupe and NSX, they will never drop too low. With the NSX, around $25k seems to be the bottom, (not counting high mileage and imperfect title) as demand would exceed supply at a price below $25k.
I don't think the M Coupe is there yet, which is not surprising given that its depreciation slows as the car ages and it is relatively new. In today's dollars, I would expect $20k is the bottom at which demand would drive the price up. Most seem to be $25-27k cars, as BMW owners tend to drive their cars and accumulate mileage (typically 40-60k on a 99).
It is hard to predict. The M Coupe is revered as a driver's car, but many people (not me) hate the styling.