I've enabled comments and in less than 24 hours I found my first spam comment. This does not bode well and is one of the reasons why I've been hesitant to enable them (that and the occasional obscene emails I get from someone who claims to be incarcerated). I may have to require comments to be made by only those registered with blogger.
I'll give it a little more time.
I will say, getting comments from people who felt they couldn't email me is a plus. You're always welcome to email, I just can't guarantee a response. If I didn't want people to email, I wouldn't have it available on the site.