Paper currency needs to be issued and backed by a bank. This could be several banks, each having their own currency (as was the case in real life for centuries), or there could be a single central bank: I seem to recall there was a Bank of Kezan in the starting zone, though that may well be just one of many.
At any rate, I don’t see how paper money could come into circulation without someone (a bank or some other big lender, even a cartel) backing it; and at that point, they would have a strong incentive to crack down on any counterfeiters.
Headcanon: elves can’t grow body (or facial) hair.
This seems to apply less and less as Elves devolve further from Highborne. Night Elves have a lot more, but High Elves still have trouble maintaining even a goatee.
Druids also have even more, including big, lustrous beards.
