Try to understand what is going on from Magico's point of view. Their product is for high end audiophiles. The overwhelming majority (I would say 99%) of high end audiophiles are subjectivists who listen with their eyes. If they see that you are using hardware store speaker cable or power cords, you will lose credibility very quickly. I don't think it would cost them anything to demo their equipment with those products either, most of them would LOVE to be associated with a company like Magico, particularly if they had gone to such lengths to get their room sounding right with DSP. Magico gets to show some street cred with their market, and those snake oil companies get people to think that amazing sound is only possible if you pay attention to everything, because "everything matters".
I am NOT saying that there is any scientific basis behind any of this, nor am I remotely suggesting that any of this is audible. It is a marketing exercise, and when you look at it this way, it all makes sense.