Floyd Mayweather is believed to have made more than $NZ400 million from his victory over MMA star Conor McGregor in Las Vegas, although he hardly needed the extra cash.

The brilliant boxer is now the $1 billion man, after a worldwide audience was left drooling for months at the prospect of the cross-code duel, helped by Irishman McGregor's astounding x-factor.

Mayweather has no trouble spending these riches and is happy to reveal how.

But lost in the excesses is a history of violence against women, including a 2011 guilty plea that led to 60 days in a Las Vegas jail.

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His ability to shop is legendary. The Sun has catalogued his extraordinary cache of toys, including two private jets and more than $NZ8 million worth of watches. It's fairly easy to find out how the man dubbed "Money" spends his wealth.

"Private jets, super cars and images showing his life of excess are plastered all over his social media accounts," the Sun writes.

While some were impressed with McGregor's ability to last 10 rounds before the TKO arrived, the 40-year-old Mayweather was as clinical in dismantling the MMA star as he is in gathering vast wealth.

Mayweather Promotions CEO Leonard Ellerbe says the boxer, who has held world titles over five weight divisions, is now knocking on the door of a very small club that includes basketballer Michael Jordan and golfer Tiger Woods, those who cracked $1b earnings.

But the Mayweather story has an ugly tragic side of domestic violence against various women. There have been pathetic excuses and attempts to extricate himself, denying he had stomped on Josie Harris, saying he instead had to "restrain a woman that was on drugs".

Harris, the mother to three of his children, said: "I felt embarrassed about saying I was a battered woman.

"I felt shame - I felt like it was my fault. What did I do?

"I didn't understand what a battered woman was at that time. Now I know I was in a very dysfunctional, hostile relationship and a victim of domestic violence."

Harris also said: "Did he beat me to a pulp? No, but I had bruises on my body and contusions and [a] concussion ..."

During the court hearing, a prosecutor complained that Mayweather always escaped the appropriate consequences for these types of actions.

In Deadspin's detailed 2014 report by Daniel Roberts, headlined "The Trouble With Floyd Mayweather", the writer states: "Floyd Mayweather is a misogynist ... and not just a misogynist, but a batterer and a serial batterer at that.

"This is a statement of fact that you will rarely see or hear from the professional boxing media, many of whom remain hopelessly dependent on the reigning box office king's goodwill for access.

"Floyd Mayweather's history of misogyny, expressed - as he is wont to do - through violence, is well-documented and reprehensible. It extends over a dozen years and includes at least seven separate physical assaults on five different women that resulted in arrest or citation, as well as several other instances where the police had to be summoned in response to an actual or perceived threat from Mayweather."

Mayweather has somehow avoided the career-threatening criticism and official sanction this should bring, and certainly anything to match the worldwide scorn that hit Tiger Woods over his infidelities. Boxing is a sport of many controlling and competing authorities, one of whom is the powerful Mayweather camp.

Mayweather himself came from a dreadful background. It is the ultimate rags-to-riches sports story - he shared a New Jersey apartment bedroom with six siblings, whose father was a drug dealer and their mum an addict.

He said: "I knew I was going to have to try to take care of my mom and I made the decision that school wasn't that important. I was going to have to box to earn a living.

"People don't know the hell I've been through."

Mayweather would find heroin needles on the front garden, no electricity in the flat and his mother stole to get them Christmas presents.

He has previously said: "I was the man in the house from 16 - that's just the way it was."

But he did have boxing on his side - Uncle Roger was a two-time world champion, Uncle Jeff was a pro and father Floyd Snr was a contender, who took the legendary Sugar Ray Leonard to the 10th and final round, before being stopped.

Mayweather had extraordinary physical boxing gifts and also an unbeatable knack for the sweet science. This was evident to the end, Mayweather in no real danger, as he let McGregor punch himself out in the opening rounds, before working him to a point of exhaustion.

He finished his career with a perfect 50-0 record.

The rewards include.-

pf■en Expensive cars galore, including a $2m Bugatti Veyron, $650,000 Rolls Royce Phantom, $480,000 Lamborghini Aventador and a $370,000 Ferrari 458. He supposedly has $20m worth of garaged cars he never drives. Of course, he also has a fabulous boat, although it could be rented.

pf■en His real estate includes an $11m Miami beach front home and plenty more, including a Las Vegas mansion with a 12-person shower and movie theatre.

pf■enHe has a collection of Birkin handbags that start at a bargain $3550.

pf■en The $8.5m watch collection is headlined by eight Audermar Piguets, eight Rolexes, two Aximums, three Franck Mullers, one Hulbot Big Bang King and one Rainbow Tourbillion, and involve plenty of diamonds.

pf■en Shoes are worn once and left for hotel staff, while boxer shorts are thrown out after the initial wearing.

pf■en His 12-seater Gulfstream III jet has a well-stocked kitchen and personalised headrests, gold cup holders and sink. To avoid extra weight, bodyguards fly on a different plane.

pf■en Even money itself is an accessory. He posts snaps of him reclining on piles of bank notes. To highlight his wealth, he can be seen in a video clip burning a $100 note in a nightclub.

pf■en He bets big, the largest reported wager being more than $6m on basketball's Miami Heat in 2013.

pf■en The Wall Street Journal once reported he had a $28,000 Cadillac golf cart. Oh yes, there was also a $70,000 diamond studded iPod.

And yet as he flaunts this wealth, you are left to wonder what his victims of violence feel.