It is no surprise that contextual advertising networks want good quality traffic for their advertisers and periodically clean house of publishers generating poor quality traffic. Yahoo Publisher Network has addressed the issue of their recent suspensions of publisher accounts monetizing through MySpace.com and publicly making it known that poor traffic sources will not be tolerated.
For those who follow contextual advertising, YPN's move is not surprising. Google AdSense has been well known for suspending publishers who participate in traffic generation schemes such as traffic exchanges or paid-to-surf programs. But this marks the first time YPN has been active in suspending groups of publishers for a reason other than international clicks.
Their public acknowledgment of the issue also brings it to the attention of those who may be using these traffic generating methods on their sites running YPN and give publishers fair warning to clean up their acts before the next wave of suspensions comes down.
For a more in-depth look at the issue, please see JenSense.