it makes perfect sense to check competition with your keywords quoted. think of it as using the google keyword tool. you have the drop down on the right to go from broad to exact. exact is what people want. if you're shopping for a car online, would you search for the term 'cars'? no because you will get every make and model ever made. if you search for a particular model of car, engine size, and color, you can narrow down your search and weed all the sites that simply mention the word car and who are not really in a position to answer your search query.