Gold is valuable because it is useless.
Gold is valuable because it is a measure of value (i.e. Gold is valuable because it is valuable).
Gold is valuable because it is beautiful. (How much is actually ever seen and enjoyed with more than a thought of “Damn, I’m rich.” Not to say gold is ugly, but it would be more plausible if most gold was formed into something more ostentatious than bricks in a vault)
God is valuable because men desire it for no other reason than does nothing.
Gold is a measure of the economy, because it measures how much extra wealth people will invest in something worthless.
Gold is valuable to sit in dragon hordes, because dragons need something to sleep on.
Buffet is to buffeted for appreciating things that actually appreciate rather than appreciate according to the population of dragons.