It is a question. I can't pretend to know his personal motivation. If that motivation was solely monetary, then he definitely made the right decision. If if he thought he was going to be a highly competitive heavyweight boxer, then maybe not. A combination of both, still the correct decision.
Most likely he looked at the remainder of his career given his age and decided to choose the option that offered him the most return. That is definitely what I would have chosen personally because it is a career. Some people have regrets you wouldn't anticipate in life though.