In actuality, the game is probably worth about $30 or so if you'd go to a store and buy it. However, many people aren't going to let go of the original game too easily anymore. It's getting harder to find in stores, so if you look online, people may be placing bids on the game for up to $70. Dead serious.
This is no joke. A gamestore near my house told me $65 for it

Even on Ebay, the bidding price skyrockets in hours for this game. The game stores go overboard with the price due to it being "out of print" Best try to buy it from a friend or website thats selling it off the books.