I interpret the Fool's Gold flavor as a commentary on fiat currency. The more Fool's Gold gets used and accepted as currency, the more value it has. Unlike Silver and Gold, the value isn't in the commodity itself, but in its use as a medium of exchange.
The weird part is that the Fool's Gold value going up is independent of how many other players have Fool's Gold. It's all about how much you use at one moment.
I mean, imagine if some guy goes to an trading table or shop and has an exchange similar to the following:
> "Hey, I got this fancy blue gold stuff to trade for goods. It's worth a lot".
> "I haven't seen that before. How do I know it's worth as much as you say?"
> "Here look, I have an extra ten pounds of the stuff"
> "Hmm, sounds legit"
It also reminds me a bit of how cryptocurrencies gain traction.