It may be different now but our scrap yard didn't want most data cable because there was so little copper for the amount of insulation and aluminum. They had a big plywood board with the price for various cables and the ones they didn't want at all. IBM Type 1 was on the "don't want" list as was the big 360/370 interface cables, most coax and modem cables.
Their favorite was bare, that is why they can't keep ground wires anywhere.
