I always read what others have to say and when I rate responses, I vote them up or down.
If I vote the answer down, I let the Hubber know in my answer why I voted his/her answer down. I like transparancy and I'm open to any response afterwards.
Some questions who keep getting answers, I stop following after a while. Mostly because they don't inspire me anymore and since I follow a lot of questions and Hubs, my emailbox gets to full.
I'd rather follow and receive notifications about the questions and Hubs that I still like, to leave new comments or rate aswers that are interesting.