Transparency is the key here. Decide what it is you are doing and be transparent about it. The way I see it, you have three options (a) be a journalist and use your blog to report things/people/events/thoughts without influence or bias; (b) be an advertorialist and use your blog as paid writing, using your blog as a mechanism to advertise things/people/events. Neither is wrong or less influential. The only wrong turn you can make is to blur the lines. And in doing so, lose trust of your audience. Set expectations, understand your strengths and limitations and understand that being a writer — both advertorial and journalistic — are held to the highest level of integrity.