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I sent them detailed info asking what the deal was, and they said they'd look into it. I never heard back, ad rev stayed the same, so I pulled them.
They also emailed a couple weeks ago asking why I left and what could they do to get me back. I emailed the same detailed info and questions as to why it seemed I was earning 10% or so of overture CPC. Again, never heard back.
YPN has been much, much better.