Gambling already becomes a profession in our time. See those top poker players? they are earning millions if not hundreds of thousands on every event not including the sponsorships and management they have. But still, even though there are people like them earning their living through gambling we must bear in mind that what worked for someone might not work for you.
Haven't meet one, but i have lot of friends who loves to gamble but turned out to have a miserable life in the end. What my perspective if you're living through gambling, i think everyday is living at the edge for you. That path maybe full of hardships and loss, i can't imagine how one can feed their family through that lifestyle.
That's what will happen if you don't have the proper discipline and you are not mentally capable of gambling meaning you cannot control and set aside your feelings when gambling. People like these will surely end up in a miserable life.