On the surface, at least, the fighters will see a massive payday. Estimates have placed Mayweather and Pacquiao's combined pay at $200 million, if not more.
But even those figures don't factor in what the boxers themselves will pay out, Carter said. After taxes and payments to promotion companies, the fighters could see half of that disappear.
Mayweather Promotions and Top Rank—the promoters representing Mayweather and Pacquiao, respectively, will also see a boon. Carter noted that promoters can take up to 30 percent of a fighter's cut, though the number may drop significantly for established fighters.
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Neither Mayweather Promotions nor Top Rank responded to CNBC's requests for comment.
Media and cable company profits will likely soar, mostly because costs to put on the bout will not increase significantly enough from the average match to cancel out the huge revenue boon, Carter said, though he was unable to quantify the comparison.
Time Warner-owned HBO and CBS-owned Showtime, which will co-produce the broadcast, will split a 7.5 percent cut of the pay-per-view, or $22.5 million, based on the $300 million projection.
Other cable and satellite distributors will split a 30 to 40 percent cut of the pay-per-view haul, according to the Times. That sum could reach $100 million, as well.