[DrewDevil]

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So if I say I am going to give you half of my cash if I win the wsop me this year, I don't have to.

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I stopped reading here. This is not true. Its called a "unilateral contract" and it is enforceable. At least so said my business law class in college.

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There has to be at least nominal consideration or a substitute for it.

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I was lied to!!!

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Basically, a unilateral contract is the exchange of a promise for performance, and a bilateral contract is the exchange of a promise for a promise. Both require consideration (a bargained-for exchange).