> e) No other use - Gold is terrible for most other things (swords, stirrups, axes....) so demand for it is purely for its value as a currency.

I don't think that's fair, unless ornamentation isn't considered a "use". Gold is pretty close to ideal for a primitive (and contemporary) jeweler/artisan because it's atypically easy to work with: it can take intricate detailing, it takes a high polish, it doesn't tarnish, it has a pleasing unusual color and unusual density, and it's forgiving (can be melted down). If gold were as common as dirt, it'd still be a preferred medium for ornamental purposes.