Does anyone have any experience with quality score in an account with a bunch of keywords that have 0 impressions? Does it make any difference? They say it does not make any difference because if does not affect the click through rate, etc. but I am not sure. Thx.
The number of impressions, even no impressions, does not affect your QS. The system needs impressions to calculate QS but if there is none, there is none and has no impact. You will notice however that a keyword without impressions has a quality score. That's because: plastic widget "plastic widget" [plastic widget] are all treated the same by the system. The same keyword will have the same QS for all match types.