Gold is very inert, yes, but it still gets beaten by copper when it comes to conductivity [0] which is why conductors are rarely ever made out of gold instead of merely gold-plated.
Gold's industry use remains negligible in the great scheme of things and only a very small fraction of its value is derived from its industrial uses. It's valuable but not that valuable.
[0] https://www.bluesea.com/resources/108/Electrical_Conductivit...