I guess I am an eternal mechanical optimist. I agree that rubber bits can be perished and the fuel injectors will be gummed up solid, not to mention the fuel pump or corroded master cylinders. On the other hand, wear items like splines, discs, brake pads, clutch, steering head bearings and valve clearances will be at original factory specs.
A bike with 6k on the clock would give me a lot of impetus to work a deal with the seller. The price could be pretty high, but I haven't seen it. I would try to work a deal based on being able to start the bike and see it running. I'd bring a jump box, and some fresh fuel in case the tank was empty and some starting fluid.
The results of trying to start would make for some good negotiating points for a better price. If it starts and idles on the first try, I would think that $4k would be a decent price for an almost new bike. On the other hand, if it won't start or idle, there would be some good negotiating points for a lower price along with any problems with the master cylinders. Tires could be another negotiating point, but if they look new, the seller probably won't budge, despite the fact they are 24 year old death traps.
I wish that bike was close to me.