The unique ways in which we search are limitless, and unfortunately there is no way to optimize for every variation of every potential keyword phrase that someone may be searching for in relation to your business. The goal should be to achieve the highest ROI for each first page keyword ranking, and with the proper keyword targeting and analytics, you can essentially assign a dollar value to a 1st page ranking. One opportunity that is frequently overlooked by many businesses is solution-based SEO targeting.
Let's face it, every business would love to rank on the first page of search results for an infinite number of keyword phrases. But, the truth is, it may not be the quantity of keywords ranking that is the most important factor to consider. Any business investing in SEO should take huge consideration to what the ROI of each keyword really is. If the keywords that you are targeting are not resulting in the right profit, then your optimization efforts are not being properly spent.