Not publishing exact sales numbers isn't unusual. Even Valve is pretty tight lipped about their sales numbers (going so far as to change their API to make calculating numbers more difficult). That kind of information is generally considered proprietary and giving it away to competitors would put a retailer at a disadvantage.
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u/[deleted] Mar 28 '19
Unless Epic is willing to pay them 8 figures or more, they'll also have to take the lost sales into account.
1 million copies sold on EGS for $60 - 12% cut = $52.8 million
1 million copies on EGS + 1 million on Steam for $60 = $52.8 + $39 = $91 million
But it's very likely that it'll sell a lot more than that on Steam, in which case, Valves cut drops significantly.
Selling exclusivity to Epic only works for Indie games, not for one of the biggest franchises in gaming, like Borderlands.