Copper is a fabulous metal. I am a sailor and I know this. And I believe the Chinese know this and is #1 on there stockpiling. It conducts electricity and is very malleable. Nickel which is 3X more exspensive doesnt have these properties. Nickel attracts crevice corrosion and becomes brittle. Copper is stronger and doesnt get electolysis like aluminum. Copper repels all sorts of growth-boat bottom paint,gutters. And tarnished is more attractive to some then shiny.