Search algorithms & popularity factors: link, social, click, blog, industry. Since modern search engines are concerned with popularity and not direct relevancy, & big firms up the price of text link buying beyond affordability...
If an article is posted on a blog and there’s no one there to read it, does it still make a point? So, don’t second guess yourself, or obsess over what you’re writing. And, the best way to make yourself successful is to help others be successful.