Not many places in Vegas that will take a $1,000,000 bet. The M Casino probably would because their sportsbook is ran by Cantor Gaming.
Still....I don't believe he actually made the bet. It's all talk, talk, talk. The sportsbook manager at the M did not deny the story because he wants the publicity.
If I ran a casino I'd take bets of 1 million and maybe more from Floyd if he signed a contract to put 500 million dollars in volume a year through my sportsbook
I live in Vegas, and have been @ the M when Floyd has gotten his azz handed to him from chasing 1stH bet loses.
He is down long term, and I believe the story. The M paid Floyd out, with his own money. Its all for show, and flash. If the book was empty, and Floyds flunkies were not around he would not even place bets.