How is it "charging a 30% margin" to keep more of your own revenue? Epic wants everyone to be able to keep more of their own revenue; they proved this by reject

How is it "charging a 30% margin" to keep more of your own revenue? Epic wants everyone to be able to keep more of their own revenue; they proved this by rejecting the sweetheart deal Apple offered them. If a company's revenues are 30% higher they now have the ability to lower their prices (unless one of the major players demands price parity to thwart competition, as does happen)