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It seems like the quality score between AdSense and AdWords might somehow be corelated. I got de-smartpriced and then my AdSense AND AdWords campaigns targeted at a set of related keywords both shot up 200% overnight.
G claims there is no corelation between AdSense, AdWords and organic G results.
Are AdSense and AdWords corelated?
So, if AdWords QS is a part of the algo, anyone not using AdWords might be losing out on QS variables. Might be worth to set up a small AdWords campaign with very good metrics.