Plating copper connectors with a thin layer of rhodium does not alter the conductivity of the copper. Or of the cables to which the connectors are attached. But not quite a complete waste of money because the rhodium will reduce oxidation in the copper which reduces conductivity and impoverishes the contact between connector and socket, saving the need to clean the connectors with solvent periodically.
@audphile1 @knownothing @digsmithd go and do a blind test and then come back