Has anyone won a sweepstakes ever?

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I had been doing some surveys in couple of sites. These sites keep telling me that I have won 3 entries or 5 entries into sweekstakes for really a huge amount like $2000, $3000 and $5000. But I was really wondering if this is just a fake or do they really mean it? I have a serious doubt if anyone has really won any of these sweepstakes and been paid such a huge amount? Please share ur experience.