europeforvisitors - 5:38 pm on Aug 7, 2004 (gmt 0)

This kind of advertisers should be banned....

Yes, they should be, according to the AdSense program policies. I suspect that one reason why such sites remain in the network for any length of time is that Google needs to develop a way to identify (and possibly penalize) them algorithmically. That's the way Google prefers to work on the search side: It sometimes leaves known spam sites in the index to see what happens when various algorithmic tweaks and filters are applied.