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I want some answers, and I'm sure other webmasters/advertisers are in the same boat as me. If they want us to continue paying, or have our clients pay for the traffic, why can't they just be honest and tell us "well guys, we are so unpopular now that we are actually selling you crap asian traffic from pop-unders".
Some people also know of smaller PPC engines/directories that they swear by, well, what are they?
Bottomline is that most of these engines are, in fact, syndicating their listings in a variety of places -- pop-ups (mostly forced transfer, evidenced by the fact that users go no deeper than that first page), emails, etc. By and large, it's not search traffic.
Bottomline, tracking each keyword across each engine is the *only* way to ensure the quality of clicks. There's a reason why they clicks go for $.05 - $.10... the key is to find the few that actually work.