A little bit of family history. My great grandfather on my mother's side own a bar in lower Manhattan in the early 1900s (and later owned a speakeasy just over a block from where I live now in Queens)
How do you get customers coming back to your bar and not going to someone else's? Give them a token worth a 5 cent drink on their next time to your bar.
The above tokens are from the Manhattan bar.
Anyway, imagine the party thief's surprise when he picks that merchant's pocket and finds a pouch full of bar tokens. Maybe the party finds a sack of such deep in a dungeon. Can they still be cashed in? Hell, maybe there is a bar in some corner of your megadungeon and only those with the right token in their possession can gain admittance.
Not all treasure is coin, gems or magic and not all coins are coins...
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