Is that serious question? Obviously no.
The mere question itself was serious. I don't know much about the betting business and whether a fighter would be allowed to bet on himself (I doubted they were allowed, but wasn't sure). The Weidman imagination was not serious of course.
In the UK no sports person is allowed to bet on their own sport full stop. Doesn't matter what the bet is for. If you are involved in the sport then the bookies consider you to have inside information. Just recently a footie player got banned for 4 months for betting on football.
Ok, makes sense.