A business blog is NOT just a way for the owner or manager to ofload about problems they're having and sharing their opinions. A business blog is a tool to share with interested readers what you do and how you go about it. 

Most people at your website don't know you and your blog brings you one step closer to a sale. Share your wisdom and recommendations and demonstrate that you are aware of the issues clients face and how to solve them. It will help them while they are researching to find the best supplier. 

It also helps your website appear in the free organic search results!