Why, we love Neil Patel. because he writes such a wonderful blogs? Am i right, No i am wrong in this case. What he is doing from his blog is - promoting his real service, render us through Kissmetrics, A website analytical tool to enhance the ROI of our investment on our sites. Every websites owners at least try once to use his service.
Their are lots of other wonderful bloggers who give us valuable help on blogging actually runs some kind of sophisticated services also. for example copy bloggers have their own theme, SEO plugin scribe.
SEOMOZ, Another Great source for SEO related information also promote their own software to analyze your website.