It depends on the post. My blog is primarily about Autism and my son who is on the spectrum. When I post about that I get about 25% of my readers commenting, since a lot of them are moms of kids with special needs.
I've never calculated the exact percentage, as the majority of our site's visitors are actually not bloggers. I think that makes a real difference. On my personal site, which I don't SEO or promote in anyway, gets a handful of comments each week, though. Maybe 20% participation...?
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Toxic Free Blog - by Brittany Glynn
Brittany is a director of the Toxic Free Foundation and created the first ever Toxic Free Certification Program. Weekly, Brittany publishes the Toxic Free Blog and provides coaching to over 10,000 families in the United States alone. She is the author of a Toxic Free educational series and co-author of several Toxic Free learning programs. Brittany is also an award winning author.