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Is this in lieu of an insentive payout up front or is it supplementary to one? If this is supplementary to an upfront payout I could see how it'd be worth it for a small dev. But if you don't get that payout up front for exclusivity I can't see how this would make any sense. I can't imagine EGS sales amount to much compared to what you'd get from a steam release; even with 100% revenue.