I mean to say that when anybody asks a question here and he/she gets an upvote, his/her reputation is increased by $5$ and when he/she gets a downvote at the same question, his reputation is decreased by $2$. However the question have got Net vote equals to zero. So he/she must get no change in reputation. So it is helpful for two people, one who voted it up and other who voted that down, to stay equal by their personal reputation.
This was brought up a few times on Meta.SE. The official SE position is stated here. Although Jeff Atwood, who posted that answer, is no longer with SE, there were no changes in the vote-reputation conversion since he left, and no visible plans for such changes.
(Fun fact: the post to which Atwood replied is also written by him; he put status-declined on his own feature request.)