It seems to be a convention of fiction. Lots of fictional terms are capitalized when real-world analogues are near-universally left lowercase. (Species names immediately come to mind.)
billybobfred
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It seems to be a convention of fiction. Lots of fictional terms are capitalized when real-world analogues are near-universally left lowercase. (Species names immediately come to mind.)
Page 77 in my copy of GoF. So, yes, Muggles can see Wizard money, at least in canon.