I noticed that I had like 202 rep points (is it how they are called?), and I down-vote an answer and I reached the 201, then did it again and then ended up with 200... Why? I looked for an answer in the FAQ and about question but I cannot find an answer.
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Downvotes cost the caster 1 Rep point, and the receiver 2 Rep points. Ostensibly, since the person casting the vote has to pay a little bit of their Rep, it helps keep downvoting from being abused.
Downvoting costs 1 reputation point.