You can make a living from gambling, but there is no financial assurance that you will not loose all your money first. There is no assurance either that if you make a career out of it, you will make it big, because gambling be it Sports gambling, blackjack, video poker etc requires a degree of expertise, chance, pattern recognition and luck (something some do not believe in).
Some examples of some Individuals who against all odds made a million and more out of gambling are;
(1) Benjamin Tucker “Parlay” Patz who won a $1 million out of parlays which is a type of sports bet in a few months.
(2) Billy Walters, who has made an estimated amount of $300 million out of sports betting and gambling in his lifetime.
(3) Haralabos Voulgaris a greek Canadian who is a renowned gambler known for his exploits in the NBA sports betting and poker.
(4) Daniel Negreanu, a Canadian professional poker player who has earned over $42 million from poker.
(5) Phillip Dennis Ivey Jr., an American professional poker who has earned over $30 million from poker.
(6) Don Johnson a professional blackjack player who during a period of six months in 2011, beat Atlantic City casinos for over $15 million.
(7) Venessa Selbst, a formidable female who has made US$11.8 million in live poker tournament earnings.
Source-
https://www.gamblingnews.com/blog/can-you-make-a-living-from-gambling/In conclusion, It is not impossible to become a millionaire out of gambling, but at the same time it doesn't come easy as even after making it, it requires a level of discipline to hold on to the money you have made. To make it in gambling, you must first choose (select) the type of gambling that appeals more to you be it sports betting, poker, blackjack etc and then discipline yourself to discover a betting style or pattern that works for you. This is the first and foremost step in becoming a professional gambler and making a living out of it.
Finally I am seeing real names for the sports bet big wins.I always used to think that this is impossible but this thread finally shows real names,many other people have claimed to make a living out of gambling but without facts and I don't believe them.I knew in Poker a few of the big names who used to play in TV in Poker Stars but in sport betting I didn't know any name.
I think it takes discipline and a very strong self will to stay patient and go on with your betting and reach up to 1 million dollars in just a few months.Inspiring!