Anyone else use freebie sites to make money ???

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I use freebie sites such as Freebie Jeebies, Real Incentives and Kudos as a way of making money along with survey sites, PTC and Adsense. Other than this I also obtain daily freebies from the internet such as cosmetics and food samples. Does anyone else use freebie sites to make money: ie: sell the gifts on after youve referred enough people. Or do most people just keep the gifts for themselves.