Bloggers have a distinct disadvantage. When someone hires an expert in " oh, let's say marketing " that expert can dispense the same information she did for the last client. And the client before that one. And the one before that. Not bloggers. Blogging is about breaking down everything you know into bite-sized chunks so that people can learn it all over a period of time. If they look back through the archives, they can often see the entire breadth of your knowledge.