The true story of copper is that it is universally utilized as an electrical conductor. Why? Because it's readily available, inexpensive, easy to manufacture and it conducts electricity very readily. The electricity coming out of you wall plug was conducted there most likely by Romex 12ga. solid core copper electrical wire. Why we suddenly need to spend hundreds of dollars on a powercord to get the electricity from the wall socket to the audio equipment is a bit beyond me. As for your interconnects, their only job is to carry a low level audio signal from point A to point B without screwing it up. You'd think that would be something that could be accomplished easily and cheaply, wouldn't you??
Good Luck
Good Luck