Nah, he won't get that much money...maybe a tenth of it. Played or not, the tape will have the signs of age anyway.
And yes, I will take good care of mine. I think it's bad though. It sounded bad when I listened to it in the original player. A good friend of mine cleaned the player and it doesn't sound better, so I guess it's crap already...but it's a nice piece of arcade history IMHO