I think that it's the media blowing it out of proportion... but him making $20M for the event isn't out of the question.
I'm sure I read somewhere that his guarenteed payday is in the single digit Million range (0-9M), but he's going to get a kick back of some of the revenue/ppv sales from the event, which could bring his payday closer to the $20M reported, but I doubt he's making that much guarenteed.
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