I've been blogging for over a year now. While you will get traffic it doesn't mean you'll get quotes or business.
You'll get a lot of not-targeted traffic. I actually just posted a video on my insurancemarketingonline.net/blog that shows the analytic between a couple of my websites. 2 traditional natural websites, a blog and one of my sites I use for PPC only. That url will skip you past the opt-in page. If you like what's there please opt-in and get updates as I post more training videos.
While I like free traffic and do what I can to find great free lead sources and ways to drive traffice, PPC is a much faster and almost guaranteed way to go. I use the results from the PPC campaigns to start targetign for natural SEO
and long-tail keywords.
While blogging is great I don't think it's the panacea everyone raves about. however, it's a lot of fun.