He already owes $5million to the IRS on backtaxes plus another $5million for current taxes on his purse. It doesn't leave him a whole lot after another $600K is taken from him since his minimum guarantee was only $10Million to begin with. Then there are still trainer, manager and advisor fees etc. He'll almost certainly be forced to fight again which could be good or bad news depending on whether you like the man or not.
Still doesn't qualify as pocket change. If it does, then like I said "Idiots do that", which would make Floyd one of them. He was already rich and owes money. Fail. Point proven.
Regular income taxes based on an estimated purse of around $15Million although he's only guaranteed $10M. Add on the $5Million settlement that he owes to the IRS and weight penalty and he'll only be making a bit more than JMM in reality.