Eric Gonzalez's startup, Ujogo, spices up free games of poker by sharing some of the company's sponsorship and advertising revenue with players in the form of prizes, luring players who want something a little more intense than they'd find at other sites.

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Earlier this year, the DoJ released a memo that was interpreted to mean that states were free to legalize online poker and lotteries, putting pressure on Congress to develop a federal framework for such activities.

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Harrah's showgirls appeared outside the main poker room luring spectators to casinos by offering free tickets to comedy shows and comps for food.

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Most free-market economists view such claims of desirable social by-products with the indignation of a poker player watching a professional gambler palm cards.

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