---> SEO's often say "build a blog" blah, blah, blah. If you believe you'll have a 'following' with your blog, or if you believe you can create 'compelling' content on an ongoing basis that is related to what your site is about, and if you can create unique (no duplicate) content on a regular basis... go for it. If not; don't waste your time.
Recently I heard an SEO 'Content Representative' for an SEO company advise a small local oil pipe fabrication company to build a blog... Well, I could have advised 10+ considerably more important things they should have been doing that would have been much more important at bringing in targeted traffic than starting a blog, for almost no one who could care less