You forgot gold is used in circuity and motherboards etc and is a better conductor than either copper or silver from the same group of the periodic table.  Gold (unlike silver or copper) does not corrode so it's use in electronics is more preferred.

Scrap metal recovery from circuit boards is a thing now and may not make a person rich, but is far from being cost prohibitive (and usually only involves chemicals, not power consumption - a far cry from the labour intensive cultivation of crops, harvesting and transport to market that were needed for the manufacture and sale of Tulips)