So very soon in the Stormlight world people with superpowers are going to essentially start hoarding money so they can have access to it's stormlight. This means that very soon the currency itself will be worth far more than what it buys.
There is a very real world problem in reality where copper based coins can have copper worth more than the actual value denomination of the coin. So people gather the coins on mass and melt them down and sell them at a profit. Now imagine if all your currency is coins and all of it is worth 100 times more.
What happens when every single unit of your currency is worth more than it's stated value? So that diamond chip that used to buy you say a loaf of bread (I suddenly can't remember anyone eating bread, do they have flour?) now has the equivalent of 100 loafs of bread in value.
What happens when your smallest denomination now is worth more than a weeks worth of shopping?What do you do when the main thing you want to trade with your currency is the currency itself? Do you make a new currency or does the price rise across the board even it out?
Do the rich suddenly become much much richer and the poor unable to buy basic necessities?