How Hope loses his wealth in the movie

Some people complain at how quickly the champion boxer loses his great wealth but, for one, it was a matter of several months, not a couple weeks. Furthermore, His accountant mentions that his funds are being burned through; he obviously had a payroll. Then it is noted that the house is mortgaged, he has zero income because he stopped fighting and his tax return was due. He then takes the HBO deal and in the first fight foolishly assaults the referee, which incurs a huge lawsuit. I would assume his purse would be withheld as a result.

Also consider the fact that Mike Tyson made and lost $300 million. Yes, Mayweather and Pacquiao make gigantic money but look at other champions in other divisions. Unless you're a boxing fan you don't know the earnings of the best cruiserweight or the best bantamweight. While these guys are making good money, it’s not on the Mayweather level. The movie establishes the character as rich but there’s a big difference between $5 million rich and $500 million rich. Plus he wasn't tight with his money. He was buying Rolexes and cars for his buddies, not to mention legal costs; all this stuff piles up. Moreover, it’s implied that the accountant and manager were taking more than their fair share.

People have made and lost millions and billions in real life, so how is it so implausible for some street tough – who clearly knows next to nothing about the financial world – to lose his wealth in this movie?

My 150 (or so) favorite movies:
http://www.imdb.com/list/ls070122364/