Your post is typical of those who make judgements about audio tweaks without ever having experience with the product. I have used audio grade outlets, plugs, power cords and balanced isolation transformers with my high end 2-channel system for quite some time and find they have all brought performance improvements. Twenty years ago, if someone had told me these things would have made a positive difference, I would have had a good laugh. Please see the following posts.
Posts in a thread on Audiogon Forums by audio engineer Ralph Karsten, the manufacturer of multiple award winning Atma-Sphere high end audio components, with technical explanations of why those few feet of power cord make a difference:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1249822202&openusid&zzAtmasphere&4&5#Atmasphere
Series of posts on the effects of power cables and power line conditioners, with technical measurements and 'scope screenshots. The author is an audio enthusiast and professor of EE.:
http://www.polkaudio.com/forums/showthread.php?t=71333
http://www.polkaudio.com/forums/showthread.php?t=71382
http://www.polkaudio.com/forums/showthread.php?t=71545