http://www.partyallstar.com/join.php
Notice that the site has links to the other sites in the network and you don't get paid for them. No linking codes of any kind and putting them there would take a programmer about 30 minutes across all sites in the network.
http://www.baileyknox.com/join.html
All of them do this... Is this a form of shaving? Perhaps you send the traffic via Misty Gates and the surfer sees Bailey Knox and buys through her un-paying link. Now you just lost a sale that most other programs would have credited you.
I am seeing this tactic more and more. We aren't talking about 2nd tier processors here. We are talking about a shitload of traffic moving around without your code following it.