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I've been trying to figure out what you mean, and I'm still not sure, (sorry).
Is this what you're trying to say? : In-App Purchases? And those in-app purchases are bought using steem?

exactly - in app purchases -
you could take a percentage and use for prizes -
keep track of the purchases on block chain - allow players to trade items (that actually have value ?)
i am thinking of one funded by a miner as well

just some random ideas

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