If the traffic is so horrible, why would people put in positive ratings regarding said traffic, or even bother to renew their terms? Maybe it's because they are actually making sales off said traffic and are happy with it's performance. Granted a lot of brokers don't allow their buyers to rate the publishers, those would be brokers I would like to avoid - because if the traffic was so good as they all claim, then they would want the buyers to be able to share that news... makes sense does it? Does your site allow ratings?
I'd have people renew their terms for 9 months or more... and if you think TGP traffic is the "worst converting" traffic there is.. then you don't really know a lot about TGP's, either how to build them or how to run them...
Stick to your IFRAME linking scheme. It seems to be working for you!
