Google says that each day 50% of the keywords used in their search engine are brand new phrases. Browsers usually search in the long tail. That is they type in 3 or usually more word phrases to find out what they are looking for.
Currently you can’t accurately optimize for the long tail. There is no accurate way of checking the keyword data as most of the phrases haven’t been recorded, as they haven’t been typed in. But that’s not the end of it.
If you tightly focus your link building and website on a very narrow keyword range you are limiting your long tail pull in capabilities. Say your sell kitchen doors. You built a website around this, and focus all your linkbuilding around one or 2 phrases, kitchen doors and buy kitchen doors.
When users type in queries such as kitchen refurbishment companies, suppliers of kitchen doors, UK high gloss kitchen door supplier, modern pvc kitchen door units, your website is unlikely to show up.
These keywords won’t pull in lots of traffic, but you will miss out on potentially hundreds of these keywords each week if you don’t have a little variation in your link building patters, and of course have those keywords as part of the content on your site.
The good thing is once your website starts to gain authority and get first page rankings for your main keywords it doesn’t take much effort to rank for keyword derivitives.
The reson is twofold.
No 1 no one else will have optimized for long tail keyword variations
No 2 once your website gains authority by having lots of high quality links it’s easier for your website to get rankings for all keywords related to your niche, and not necessarily ones you’ve especially optimized for.