Yesterday I posted this and a few of you asked some important questions so I thought it my duty to bring answers to you.
On the EC Blog I read that you earn credits for all comments you leave. The community as a whole rates the comments. Including the blog owner. So you also earn credits based on the ratings. The ratings also help to find the spam comments from the good ones. Though I have decieded to moderate my comments to try to prevent spam from coming through anyways. And I have noticed that even if a comment is already rated by someone else you are still able to rate them too! I hope this helps to clear it up.
I will now go back to my regular scheduled blogging!