Why do so many blogs have no contact information?

The purpose of blogs is to communicate but too many bloggers ignore one of the most obvious ways, email. Comments are fine but email is also a time-honored and effective method for getting conversations going. Yet many blogs don't list an email address. 
I've been slogging through blog directories finding bloggers who might like to write on Independent Voter Network.(Email me at bob@ivn.us if you're interested!) Way too many of these blogs gave no way to contact the editor. Therefore, I had to pass on contacting quite a few excellent blogs. They're missing out on communication and learning about new things. I get a steady stream of email here at polizeros because I have my email address on the aAbout page and sidebar.)

If you're afraid your email might get spammed, do what I do, forward all email accounts to Gmail, which has the best and most effective spam killer around. Problem solved! If, for some reason, you don't want people to know who you are, use a special email address for the blog only. But not allowing people contact you seems counter to the point of having a blog. Some blogs had no email address listed but did have contact forms, which to me seem stilted plus someone can type their email address in wrong, and then what do you do?
Tech blogger Robert Scoble makes his email and phone number completely public. Trust me, he gets way more email and phone calls than most of us do. But he says this is the best way to insure anyone can contact him and you can always hang up on the occasional loony phone call.

Bloggers, don't hide from letting people contact you!
Shared publicly