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You are not the only one who is confused by the phrase and like what I always say when I see something like this, I just think it's a lie being told to himself by the gambler because I have come across so many gamblers who actually think they can actually do or should say take their gambling habits as a steady income heaven that he can use to pay for his children school fees and feed his house hold. It's funny how people can blatantly tell themselves all these lies and even believe in it and these kind of stories or lies are very dangerous and can entrap another gambler to become upsets with the habit feeling he can acquire same feat being talked about.
With what you're saying, I think this phrase isn't a real thing and might just be altogether a lie itself because I still can't believe that someone thinks that gambling is a way to make a steady income. I mean how can this be exactly true? Gambling makes you challenge the odds in hopes that you're going to get a reward but steady income like a job? I don't think this is ever true so maybe that's the reason why I can't believe it because OP is lying that this is a thing that gamblers believe but then again if there's really a gambler out there that thinks like this about gambling I don't know what to say to them, maybe I'm appalled thatthey think about gambling that way?