dragons hoard gold and treasure but as far as i can tell they have no use for it as actual currency. dragons dont really need material wealth because they can do whatever they want and no one will sell anything to a dragon (a dragon can just take whatever they want anyway)
possible theories for why dragons hoard treasure:
- like many species of birds, dragons are instinctually attracted to shiny objects for no other reason except to attract a mate with their beautiful nest
- their favorite cartoon is scrooge mcduck
- dragons just enjoy killing/eating rich kings, landowners, aristocrats etc.
- they intentionally manipulate the global economy by withholding material wealth from the market