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Publishers Clearing house is not a scam, and people do win. The problem is the amount of entries that they receive vs the chances of winning, gives you very poor odds.
The Publishers Clearing House has been giving away large amounts of money to one lucky winner for years. This goes over the Faqs about PCH: http://contests.about.com/od/sweepstakes101/tp/publishersclearinghousefaq.htm