Great piece by Randy Murray on taking your blog seriously:

But it only does these things because I take it seriously. This blog is a part of my job. I spend several hours every week writing and rewriting articles and I spend time every day responding to readers via email, in the comments on this blog, and on Twitter. This blog is not an afterthought. It is central to my business and my idea of myself as a writer.

If you blog for yourself or your business you should take your blog and your writing seriously. Blogging is not free. Even if you do it yourself, you must spend time, attention, and energy to do it well. And if you hire someone, like me, to help you with your blog, it will not be inexpensive (although it will be less time-consuming for you).