Gary, hopefully it didn't really sound good to you, because if the comment was meant other than jokingly, it's sheer nonsense. Any copper exposed to air(e.g., the stripped end of a speaker cable)will have some surface oxidation over a long period of time which can either be cleaned off with a mild abrasive or the stripped end can be trimmed off and another half inch stripped. This is true regardless of whether the cable cost $1 or $100,000.

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Enjoy the music, not the equipment.