Comment by roenxi

https://pse-info.de/en/scale/price - gold doesn't stand out, there are a few similar ones (Rhodium/Palladium/Iridium/Platinum). I haven't checked, but we'd probably find the gold price sits in a boring-looking distribution of the prices of other elements. Probably an exponential or something that could be mistaken for it. https://en.wikipedia.org/wiki/Prices_of_chemical_elements if you prefer wikipedia.

If it wasn't radioactive, poisonous and pyrophoric people would probably all just leap into the Neptunium market.