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Correct.  I double check all comments and follow them back to the owners site.  If the owners site is spam I typically report it.   So I think what you're saying is there isn't a downside providing your super diligent on monitoring the site...is that correct?

Thanks for this feedback.  I like to think the content is solid and getting good participation is key. I'm just trying to understand the SEO downside to allowing people to post comments with links to their sites or blogs.  Keeping in mind my blog is a photography blog so people that comment typically have photography blogs or portfolios.  I delete any and all spam.   I guess my question is does this hurt your search ranking with Google?

I have a photography blog that I'm really trying to promote solid commenting.  What is everyone's opinion on nofollow vs do follow comments?