I guess I am missing a point here. So I down voted an answer and now this answer has -3 reputation. Can somebody explain why my point is deducted? This is the link
You loose rep for down-voting answers. It is used as a deterrent; it discourages unnecessary down-votes, or down-votes that are in your own self-interest rather than the interest of the community.
Down-voting questions, on the other hand, looses you no rep at all.