What is the pure copper supposed to help? I've not heard of this. Depending on what it is supposed to do, it may not be so irrational (except for the fact that most room acoustics are lousy and mess up all of your efforts in electronics). After all, the power company only provides you energy, not electrons. You just slosh the same old electrons back and forth in your wire.
Which is cool 'cuz those power company electrons would be coming from a long ways away and would obviously be tired by the time they got to my house.