SEO Vs PPC – Search Marketing Is Not A Fight
For example, we knew from our Google Adwords PPC data that the search term “accommodation swords dublin hotel” although having low volume, converted at 80% over a six month period. Using some simple SEO methods we were able to quickly and easily optimize the site for a number one position in the organic results for that term. That’s great, but as I mentioned, that search term as you can imagine has a very low volume. Do that one hundred times for search terms that you KNOW convert from testing with PPC and you have something pretty amazing. This is the idea behind long tail search engine optimisation.

http://www.redflymarketing.com/blog/dynamic-keyword-insertion-the-ultimate-guide/