Some currencies require less faith than others. Like when a large organization with an enormous infrastructure insists on paying in that currency and demands payments in that currency. And when that large organization is in control of the land you live on -- including depending on that organization to defend that land in case of invasion.

There's a whole lot more behind those currencies than with Canadian Tire Money or Flooz. When you live in the place you're committed in a way that you just aren't with any other currency. Losing faith in that currency is bad for you in a way that goes far, far beyond the exchange value of a token.