i believe that as my project manager worked in vegas for 3yr and he said he couldn't get any casino that was on the strip to take anything over $2500...had to go off the strip and even then the most they would take is 5K. he got to know some very important people running the casinos and they all said the same thing, they dont take big public bets..they all have a very strict policy..im sure they have a small clientele that is confidential that is aloud to make larger wagers.
They will take bigger than that depending on person. I wouldn't be surprised if a book would take those size bets from Floyd. Not saying they are real. But books do give bigger limits to celebrities and whales