I don't get all the "who would spend money on that?" posts.
People will pay out the ass for collectibles. Why do you think the Ferrari Enzo can go for up to $1 million? Because there's only 250 made, it's a Ferrari, and it's made out of the very very very best parts ever created. But it's just a car, and whoever would pay money for it is completely retarded.
To some people, that cartridge is worth the money. It's extremely rare and made out of solid gold. It's worth $25,000 based on that.