I almost always comment on any hub I read, unless it is really poorly written and I can't find something nice to say. Then it is better to keep your mouth shut.
If I comment, I do not expect people to read my hubs. It is very nice when they do.
If I follow someone, it is because I want to read more of their hubs and I not only do not expect them to follow me but unless they want to read my work, I do not want them to. Only follow someone whose work you are going to read.