How much do you tell of yourself to your potential customers?
If it's intended to be a way for you to connect to your customers, then I think putting in a personal touch can be a great way to humanize your business. As someone mentioned earlier, if your revenue comes from ads then gossip or drama will definitely bring in some readers.
However, the needs for blog are a bit different. We needed to:
* Provide concise, useful content for busy entrepreneurs
* Establish credibility which inherently upsells the paid content
* Keep the content highly relevant for SEO
In the end, I think the answer to your question depends largely on your target demographic, and the purpose of your blog.