Guys, what do you think about those famous people in other sports (like UFC, MMA) then suddenly will shift into boxing, not via professional boxing, but as an exhibition match? Or those who are already retired but suddenly will participate in an exhibition match against a non-boxer. It was all started by Floyd Mayweather Jr. and then from there, lots of boxing exhibition matches have been executed.
And the sad part, these people who are participating in exhibition matches are being paid more compared to professional boxers.
All I can say is there's no law making what they are doing illegal, so it's alright.
If we don't like to see that happening, we should not be supporting that kind of event, the only reason why they are confident in holding an exhibition fight is that we are willing to pay, and since they are good at marketing their fight, people get hype and that resulted on them making more money.