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No. If a particular ad copy is used for a "strong" keyword and an "at risk" keyword, it will not adversely affect the performance of the strong keyword in any way.
But obviously, your overall campaign performance goes down.
Wasn't sure what the benifits of creating seperate ad-groups to host other kw/kp's in the campaign.
Maybe some1 can enlighten us what are the major benifits of having several ad-groups rather than the one running in your ad campaign?
If you have an ad for: blue fuzzy widget, and you have 300 spelling variations of blue fuzzy widget, then the same ads will be useful for all those terms.
The more specific your ad is to your keywords, the more effective it is. So making another group of ads for red fuzzy widget would lead to higher relevancy (and hopefully ctr) than using the blue fuzzy widget ads, or just a fuzzy widget ad.
It's about making the most relevant ad possible to the search terms which trigger your ad.
To me, a high quality keyword is one that specifically describes what you have to offer, and is a perfect match for the ad that appears when the keyword is searched.
Again IMO, a low quality keyword is usually one that is very general and/or only remotely related to the product or service that you actually offer.
Since I seem to (ahem!) be heavily into opinion in this post, here's one more: a dozen great keywords, are worth more to you in terms of CTR and ROI, than 1,000 bad ones.
AWA (Now stepping off soap box.) ;)
making another group of ads for red fuzzy widget would lead to higher relevancy (and hopefully ctr) than using the blue fuzzy widget ads
Even better than a higher CTR is getting customers who know exactly what you are offering them. I find that broad ads tend to bring in a lot more unqualified traffic.
If the title for your red widgets ad is "Red Widgets - Only $99.99", a user won't click on your ad if his budget is lower. However, if you had grouped your blue widgets together w/ your red widgets in one ad, you would have had to write your offer about all widgets which start at $19.99. With the untargeted ad, you would have to pay to inform the customer he doesn't have enough money to shop w/ you.