I really don't want to get in the middle of this, I think you guys actually agree more than you realize.
That said, I don't think the fact that PA companies use run of the mill copper cables has anything to do with a high-resolution system inside someone's acoustically treated and dedicated audio room.
Of course there would be little to no perceivable benefit to using esoteric cables in a sound reinforcement situation inside some terrible sounding concrete and steel arena.