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Imagine everything humans could accomplish if we were not a commerce based civilization.
(self.showerthoughts)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
Commerce is fine, greed is not. OP missed that distinction.
Commerce != currency
Currency is a natural evolution of commerce. Direct barter only works if the person selling what you need wants something you have.
Say you want to buy flowers. If the florist wants shoes and you only have bread or hammers to spare, then tough luck.
Any large society cannot function with such a clunky way to exchange goods/services. Currency is merely a proxy that allows both sides to trade their goods using a tool they both value similarly. Hell, some civilisations used giant boulders as currency... it's hardly a new concept.