Yeah I doubt any of these fights ever happen, these guys make too much money, for example GSP's got deals with Coke, Gatorade, Bacardi, Under Armour, Google, Affliction, and is raking in 15 million a year.
Why go up and fight Anderson when he can keep doing what he's been doing for the last couple of years? Same thing applies to Anderson and Jones, although I've never heard a report on how much they make.
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