Well, they do work. I am racking my brain trying to remember the name of the company, but I just read a large article on a trading/bartering company, that gathers partners just for that purpose.
The jist of the article was that they were expanding, and doing quite well, with 1000s of satisfied trading partners.

If I find the article I will post it.

Jay
Outbuy Procurement Solutions
www.outbuy.ca