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blaze - 12:04 am on Jun 6, 2004 (gmt 0)
Sometimes, they just want to get the highest converting affiliate on your website. They have to make sure they keep their AdWords customers happy (after all, that's where all the money is coming from..)
Another thing to keep in mind that sometimes Google is at odds with their publishers. They do not always want to get you the highest paying advertiser on your website.