There seems to be no limit to the gullibility of the committed audiophools.
A few years back, there was a guy by the name of Tice who was selling a magic digital clock that would work wonders when plugged into the outlet powering the sound system. It was claimed to "realign the electrons" coming from the outlet, greatly reducing "grunge" while improving "soundstage" and "presence"!
It turns out that this clock (selling for a few hundred bucks) was simply a $15 Radio Shack item that Mr. Tice had "specially treated" and resold.
The Tice clock and other such audiophoolishness ($1000/foot speaker cables, anyone?) were the subject of a great column by Bob Pease in Electronic Design, available online at:
http://www.elecdesign.com/Globals/PlanetEE/Content/768.html