Tubes, cables now this. It seems more like religion or superstition than technology IMHO. If you want to take it to the limit, hire someone to come into your home and perform live for you, then you can eliminate all the sources of distortion. Not only would you be hearing the ultimate perfect sound, you would be providing employment for artists. Seems like a win - win to me :)
My advice to everyone is to never ask a hard-core gamer what he's tweaking when he's got his favorite rig open, and cards scattered all over the workbench. There's enough technological superstition in some of them to summon the devil.