http://store.audioholics.com/page/av_university#topic4

They have done a lot of cable testing, with very interesting results.

3 years ago over at C-net forums we were discussing cables and someone asked about a $2000 power cord.
My reply was that you are going to plug a $2000 power cord into $0.49 duplex outlet wired to the cheapest 14ga wire that the contractor could get AND some how the $2000 power cord will work magic and make your amp sound 2000 times better.

There are people that took PT Barnum to heart and take unsuspecting people to the cleaners with all sorts of scams. Exotic cables are one of the scams.