I think it makes you wonder why.
The problem with voting up or down is the person does have to leave an answer or make a comment.
It's one thing to vote something down and state why you did so which could possibly open up an interesting discussion and it's another thing to vote it down simply because the hub, answer, or comment was not what your were looking to hear.
I have never voted down an answer to one of my questions.
I accept and respect a difference of opinion.