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It would seem that Yahoo!/Overture does not care much about the quality of traffic sent to their advertisers.
As long as we keep bidding, they will keep sending enough junk to pad their checkbooks.
You can't turn it off, because it's not content match. I have complained to Yahoo several times about it, but it falls on deaf ears.
My solution... spend more with Google, and wait for MSN's PPC engine.
When Yahoo loses MSN their network quality is going to be the same as FindWhat's, or Kanoodle's.