Do you object to the use of the metric system in our currency?
Or would you prefer to calculate change for someone who gave you a half crown, a florin, a sixpence, and a farthing?
I delight in exotic foreign currency. If they want to use such coins, what skin is it off our nose? The thought of a uniform worldwide currency is repulsive to me.
It's five shillings (how hard is that?) and how much change the nice man got would depend on the price of whatever I sold him.
The old British monetary system had the same advantage as the English system of linear measurement -- practical flexibility. It's divisible by 6 and 12 in all sorts of ways, which is easier math to do in your head. And like any other system, you get accustomed to it. I lived in Britain one summer, and it took me about a week to figure it out.
Besides, how could you expect American GIs to be able to strike up a conversation with a pretty local girl without being able to stand outside a shop staring at a coin and then ask her "how many shillings are there in this?"
a half crown, a florin, a sixpence, and a farthing
Funny, when I lived in England, they hadn't used any of that old currency in a very long time.