I have found several times that people misused their reputation in closing questions on Stack Overflow.
closed as not constructive by Welbog, ChrisF♦, Brandon, Michael Mrozek, Arjan Dec 8 '10 at 20:30
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It takes 5 people to vote to close a question, which means that those 5 people all agreed that a question did not belong on the site, and closed it. I don't really see how someone is "misusing" their reputation.