Oh definitely, but to liken boxing (where the possibility of serious injury is presumably far higher than in others) to any other sport would be a little unreasonable in this instance.
Without wanting to seem tremendously cynical, I can't imagine many agents stopping him picking up a tv fee when they're likely to benefit somewhere down the line as well.
That said, I suppose it's entirely possible that FB needs the money and this is the best/quickest way to get it, even with...