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Does anyone know if a low Campaign CTR affects Quality Score in some of the high CTR ad groups that are in the campaign?
As for it's effect on QS, there are two quality scores: one that determines your ad rank (where you show up in the sponsored results, and for your landing page quality. The landing page quality score determines how much you need to 'pay to play' for minimum bids, and a whole bunch of other stuff. I'm not aware of CTR affecting landing page QS, but who knows these days....