I'm not completely new to Adwords optimization, but I guess the learning process never really ends...
My company is focused tightly on a specific niche. All of my keywords (across several ad groups) are set using the modified broad match. So for example, I'm entering all keywords like this:
+baseball +training +kids
I understand this means any query containing "baseball" AND "training" AND "kids" (in any order) will trigger my ad, which is good.
A few questions:
I hope these questions aren't too far "in the weeds" for this forum... Just haven't found a reliable Q/A site for Adwords.
I think you are correct, you will surely get more impressions using modified broad match. It's good that you are not using exact match terms, as it will be hard to get impressions by it. Well, it might be possible that your quality score decreases, but it shouldn't bother you much after seeing the advantages. You may also try this link for knowing Adwords concept in a better way. http://www.dpfoc.com/blog/does-adwords-really-work
You will definitely get more impressions with broad match than phrase or exact. However, the question is quality vs. quantity. If you're using the "right" phrase and exact match keywords, your overall cost per conversion will be lower (theoretically) because you won't have as many low quality impressions.
However, the way I approach this is not an either/or situation but a staged process:
Here's how it would work using your example. I start out with +baseball +training +kids. As I watch the clicks roll in, I notice a bunch of searches for "potty training kids" so I add -potty as a negative keyword. I'll keep doing this for a while and maybe I see that the most common search is "baseball training camps for kids." So I'll create a whole new campaign with that exact match phrase with ads that use those words specifically.
If you run broad and exact/phrase at the same time in the same campaign, you won't really learn anything because the exact/phrase matches are a subset of the broad. In other words, a search for "baseball training for kids" will show up for +baseball +training +kids and [baseball training for kids] and "baseball training for kids". I use the broad match for research and the phrase/exact for optimization. Eventually, the broad searches tend to get shut off over time once you find phrases that work.