#5 The Money

McGregor is worth around $100 million, but the Dubliner is not shy to tell us that he desires money and wants to make more of it. The Irishman made approximately $85 million in his fight with Mayweather - a jaw-dropping number for a person who's fighting his first boxing bout.
While the McMahons and WWE cannot offer him a full-time due to his huge salary, a one-off appearance at an event, say WrestleMania, would set tongues wagging, and bring a lot of money for the WWE and McGregor.
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He was reportedly offered a big sum to make an appearance at a WWE event, but the McGregor camp felt that those weren't big enough numbers.
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