Either you're misinterpreting, um, everything...
... or one of the poll options (platinum) is completely impossible.
My guess is that we're trying to solve completely different things. I'd like to solve the fact that gold is the standard medium of exchange and thus mundane; I don't care too badly about portable liquid wealth, because it's an abstraction, and my characters are already fully laden with loot.
I'm attracted to silver coinage because it lets me posit an easily transfered, standard unit of wealth (
for adventurers) above the level of the base coin that isn't platinum. This isn't platinum's fault; it's just not as cool as gold is for the purpose.
ninja edit: By easily transfered, by the way, I mean "not a gem or art object", not "dollar bill woo!"
You seem very dismissive of this point of view; am I just misreading you?