when did these become worth something? I have 24 of them, in box. New
I've seen tons of discussion by many people who swear by them as the absolute best keyboards of all time. In fact, I believe there's a company that makes a living by selling replica Model M keyboards but with USB ports (and maybe Windows keys).
Most definitely worth something, hehe. Oh, and as for whether or not the OP's keyboard is dirty, apparently you can run it through the dishwasher somehow - I forgot the details, but they're sturdy things.