And many probably don't want to.
Despite being the purist of all sports, boxing, like the NFL, NBA and MLB, is a business too, and decisions are often made based on their perceived long-term financial repurcussions.
Hence, some things in boxing, like some things in life, aren't always what they appear to be.
Enter: Mike Tyson vs Larry Holmes, January 1988
To most observers, the great old king was thoroughly beaten by the great new king, a ferocious young lion we thought would reign for years to come.
The 21-year-old Tyson pummeled his 38-year-old foe, knocking him out in the fourth round. In fact, Mike Tyson, in knocking out Holmes, had done something no other fighter had done at that time or sense.
It was a pretty big deal.
The torched had been passed and Tyson's team, including promoter Don King, got what they wanted... An impressive, decisive win in a high-profile fight bout against a legend.
Mike Tyson's stock would surge.
What many don't know is how King used his influence as the promoter to stack the odds in Tyson's favor (As if he needed any to begin with).
Holmes recently told Salfordstar.com:
"Mike Tyson was tough but you've got to remember something" he added "For two years I was off and did not fight."
"They come to me, offer me a lot of money to fight Mike Tyson and I said `Three and a half million dollars? Where's Mike? Let's go get him!'"
"He beat me but I think if I had more time to get ready and train for the fight then it would be no problem."
Don King offered Holmes big money to the fight with the then surging, undisputed champ but there was a catch. Holmes, after a two-year layoff, wouldn't be given the necessary time to get in shape for a fight of that magnitude.
And when Larry balked at the timing of the fight, insisting he wouldn't have enough time to prepare, King threatened to walk away and give the title shot to another fighter.
"They gave me the time I needed to prepare but then took it away," he explained.
"Being off for two years you get rusty. I was with my band singing and hanging out, and then they come to my house offering me that money and I couldn't turn it down."
It was likely Don King's plan all along to lure the great old champ out of retirement with the sole intention of not giving him ample time to prepare.
At the time, Mike Tyson was young, fierce, in-shape and obliterating opponents. And Holmes, close to 40 and out of action for two years, already had the odds stacked against him.
In limiting Larry's time to prepare, King further stacked the cards in Tyson's favor, taking away any reasonable chance Holmes would have had.
But in Don King's defense, that's what a shrewd promoter does.
Tyson vs Holmes highlights