I went to Twitter when I found out I have cancer, and I am keeping my followers posted about it every week. Because I don't see them just as "followers", they are people interested in what I have to say. I value those people.
Yes! I agree. I "follow" somebody or some company on Twitter because I am interested in what they have to say. Come the day they becomes less interesting to me, I'll "unfollow" them.
I don't follow somebody in the hope that they'll follow me back.