Everyone who gambles regularly lies, either about what they win, what they lose or both. It therefore makes sense that most of these people who claim to earn a living via betting would be fibbing. Not that it isn’t possible, i’ve looked into spread betting, but it was so fucking boring that i might as well just work.
I’ve met a lot of people who clsim to be professional gamblers. Only one that i know of actually was and seemed good at it. He was a pretty good poker player, to the point that he’d have big wins at casinos and ended up working for a website, betting from home. He knocked it on the head within a year, though, so how lucrative could it really be if he didn’t feel it viable even when not betting with his own money?
If you’ve got capital, your best chance would probably be big stake bets on low risk outcomes. If, say, United, or Dortmund, or Juve are at home to a poor side pile on and take the 15% or 20% profit. You might get unlucky, though, and it certainly isn’t a career, but i think you could earn a few hundred quid a month quite easily.