The main reason is that the "Adwords Quality Score" relies somewhat heavily (70% - 80%) on the "landing page" URL and the words therein, plus the domain name of the landing page.
Which, by the way is the only thing at Google that genuinely does.
So people could subvert/improve the QS of a particular campaign by redirecting "QS optimised" display URLs to a single landing page that covered campaigns for different word/phrase sets.
Another is that "landing pages" for markets and sites that are banned from Adwords could be redirected from otherwise innocuous campaign keywords.
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A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?
Last edited by Jim Gillum; 05-20-2012 at 10:42 AM..