Conor McGregor is an elite MMA fighter, but stands no chance in a boxing match against Floyd Mayweather. (AP)

There is little good about a boxing match between Floyd Mayweather and Conor McGregor, other than the huge amount of money it would generate for those involved: Mayweather, McGregor, Showtime and the UFC.

Many involved in the boxing and mixed martial arts businesses believe the fight would exceed two million in pay-per-view sales and could reach three million. One highly placed executive who would not be involved but who has a long history with pay-per-view events thinks Mayweather-McGregor would have a chance to break the 4.6 million sales mark set by Mayweather-Manny Pacquiao in 2015.

Those kinds of sales projections are what make it even remotely possible that the fight occurs, though nothing is close at this stage.

But 4.6 million sales at $79.95 a pop would generate $367.8 million. If the fight were to be held in Nevada, where it would attract the largest paid gate, it would seem to be a given to sell at least $20 million in tickets and perhaps three times that much.

Without even factoring in sponsorships or other revenue streams, this would mean a pot of around $400 million would be there to divide up. Guys have fought over a lot less.

Money, really, is the only reason to do this fight. Boxing and MMA are similar, but different sports. The skills required in one aren’t the same as those required for success in the other.

Mayweather is a -2500 favorite, while McGregor is +1100, meaning oddsmakers give McGregor little-to-no chance to win. If it were an MMA match, the odds would be just as high, but in reverse.

Imagine a great softball hitter being asked to hit a home run off Clayton Kershaw in game conditions and you have at least a basic understanding of what McGregor faces in trying to defeat Mayweather in a boxing match.

But when guys can earn that kind of life-altering money, it’s hard to say no.

More and more these days we’re hearing about a boxer wanting to fight an MMA fighter, or vice versa. But given that there wouldn’t be life-altering money in any of these other potential fights, the answer from all involved should be simple: No. No. No. No. No. A million times, no.

It’s hit the ridiculous stage.

After his impressive knockout of Corey Anderson at UFC Fight Night 107 in London, light heavyweight Jimi Manuwa made a shocking call-out in the ring as he soaked in the adulation from his hometown fans.

Manuwa didn’t ask for a rematch with Alexander Gustafsson, or call out Glover Teixeira, in what would be an outstanding match. Rather, he called out boxer David Haye.

“David Haye, let’s do this,” Manuwa said in the cage. “We’re two of the hardest hitters in London. I think the fight makes sense.”

It makes zero sense, and even though Haye told the Express in London that he would accept the challenge once his leg heals following surgery, it’s not going to happen. Nor should it.

Haye was quoted in the Express saying, “We have heard from Manuwa’s management and UFC, so it is something that we are looking at at the moment. Obviously, it is a little way off being confirmed. But it is a fight that would unify a lot of the fans from both UFC and boxing and make a mega-event.”

But UFC president Dana White told Yahoo Sports on Thursday that it is not true and that the UFC isn’t involved in talks aimed at making a Haye-Manuwa boxing match.

There have been numerous other fighters who are looking to do a boxer vs. a mixed martial artist match, and they’re all equally hare-brained. Recently, former light heavyweight champion boxer Jean Pascal called out UFC star Nick Diaz.

There isn’t much in it for either side, frankly. For a boxer, who has spent his or her life training in that one discipline, where is the upside in beating up on an MMA fighter who trains in a multitude of skills but who hasn’t boxed at all or has boxed very little?

Most boxing fans haven’t heard of Manuwa and most MMA fans haven’t heard of Haye. They’re in different sports and at different stages in their careers. Manuwa, 37, is older than Haye, but is still in his prime and is moving upward in his division.

Haye, 36, is nearing the end of an excellent career that saw him capture cruiserweight and heavyweight world titles. But he’s coming off a knockout loss to Tony Bellew and had surgery after the bout.

All athletes risk their bodies to some degree or another, but in fighting, where the risks are higher than in most sports, it’s hard to deny fighters a payday that they couldn’t get anywhere else.

But it would be a farce to see Roger Federer compete in The Masters or for Rory McIlroy to play Wimbledon.

And it’s equally farcical to want to see a mixed martial artist compete in boxing against an elite boxer.

In the case of Mayweather and McGregor, they’re such amazingly good promoters that they’ve built interest to such a level that they’ll command extraordinary amounts of money to come together.

None of that is true of the rest of them, which is why it’s a great idea to drop that thought now and never allow it to resurface.