WordPress is a great Content Management System
By boosting your topical content, you increase the value and relevance of your site. The more new stuff you add, the more authoritative you make your site, and this helps to improve your overall search rankings.Increased Traffic
Blogs are great for increasing traffic. Aside from the added traffic you may see from search ranking improvements, if your blog is interesting and topical. You will get repeat visitors to your site as readers check back for new posts. If people really like your blog, they will spread the word, resulting in even more visitors.
By blogging regularly about your industry you will help to establish yourself as an expert. Sharing your knowledge can help to instill trust onto your visitors which can result in increased conversions.
A good, well written blog can result in free one way links to your site. Sometimes it is as simple as a fan adding your link to their blog roll, and other times it may be RSS working its magic.