It's a very nice bike, but at that time it was competing with bikes with higher spec tubing (753 and SLX) and even Alimunim and the early CF bikes, so even though it sits at or near the top of Trek's model line back then, such bikes were losing it's "luster"/wow factor to buyers.
I would think that bike has a value in most markets of around 600 bucks, max in VGC,.........which frankly is a bargain for an excellent steel framed mid 80's bike, with TOL Suntour Superbe Pro Group on it. A hard core Trek fan would most likely be willing to pay a bit more for it.....