Usability guru Jakob Nielson isn’t in support of writing content for search traffic:
If you are a specialist who would like to live from contributing to the world’s understanding, you have to exceed the mainstream Web type of single page visits driven by search traffic. You have to change the overall game and make content that’s so valuable that business customers are prepared to pay for this.
It’s also wise to concentrate on material that lower-rated content contributing factors can’t easily create within their free time.
These two needs are met whenever you produce in-depth content. Link