Renzo Gracie was the promoter so I don't know what the deal is. BJJ is a close community, and I guarantee you this pissed a lot of people off. Renzo and Cesar are fairly tight so I'm sure they are both pretty pissed. Nick was even talking using BJ Penn leaving Ralph (Renzo's brother) as a way to get angry when they fought. Renzo is an icon, and I really doubt he was pulling anything even close to shady.
I would think the majority of those PPV sales were for the Diaz fight, and he made a big deal about donating his purse to charity. There were some issues with Braulio making weight, but he made it and everything was set. There were also a number of guys willing to step up and fill in for Nick at the last minute, but Braulio was super pissed and not having it. He called out Diaz for an MMA fight, but that will never happen either.