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Gold is a better conductor than copper and gold also does not corrode. So they actually are better cables, since the thing the cable does is made significantly easier and less prone to failure when the wires and connectors are gold and not copper or some other metal that doesn’t conduct electricity as well.
Gold is a worse conductor than copper. The benefit is just protection from corrosion.
(Copper conductivity is 6 * 10^7 S/m, gold is 4*10^7 S/m. Silver is 6.3 * 10^7, but very prone to corrosion).