Gambling on a long-term as only means of livelihood is that actually attainable judging by how even in games where skills are required to be able to push ones luck you aren't still guaranteed of getting even 3 times wins in 10 gambling sessions. I don't believe anyone is living on gambling and is comfortable with it either.

People that claims to live on gambling wins do also have some side hustles that brings in regular cash to their pocket but they wouldn't want to make it known just to make people believe they are doing great with their gambling expedition. Let no be deceived.