If it's being used as more than just 100Mbit or 1Gbit patch cable there is some merit in a special cable. Still a total rip off though since in no way would it cost that much to make.

For more laughs:
http://www.ilikejam.org/blog/audio/audiophile.html

Audiophiles are true idiots IMO... and idiots and their money soon part. Stupidity tax really. When they start arguing over things they don't know about they just dig deeper holes for themselves.

Things like a special CD format with a "clearer" plastic to sound better is a good one.