Are contact treatments worth the money?

I consider the Walker Audio Extreme-SST contact enhancer an integral and necessary part of my system. I use it on all contacts and had my electrician use it on all the electrical connections for the dedicated AC lines coming into the listening room. I continue to have the same reaction to the Extreme-SST as I shared in my post several years ago:

http://forum.audiogon.com/cgi-bin/fr.pl?ymisc&1101694286

Highly recommended when used as directed -- sparingly!
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Walker SST and Caig DeoxIT Gold (X2)!

I like Kontak myself....and yes they do work...I use a pipe cleaner and you will be amazed at the amount of dirt / junk at the end of the cleaner when your done

hmmmm. any scientific testing to back up the implied improvements? Got to watch out for that placebo effect.