"Lets remember that the room is the most important audio component and which provides the largest contribution to the "sound" of a system ( some have pegged that contribution at about 50% )."
What about ears? More precisely, the level/loudness of sound. For some reason, that does not get mentioned while it is easily one of the most crucial components of perception of the sound. I am talking about physiologically normal ears working well, not limited due to aging, hairstyle, or whatever else.
EDIT: Having no experience with "expensive" cables, I cannot claim it but I suspect that ear-accommodation effects may trump benefits gained from cables. I am not trying to argue that cables do not matter, but just remind about another big variable in the story.