Because of the claims you've made about how it changes the sound. You're using audiophoolery buzzwords that have little to no actual meaning.Magic speaker cable? This OFC copper cable came from Maplins!
I've changed the effective gauge from 17 AWG to 14 AWG, you do understand this is the same as a single 14 AWG run? If you understand that thicker OFC copper cable is better, then how could you possibly disagree with what I've done.
My main HiFi uses 4mm DCSK speaker cable BTW.