I know a few, 1- Young guy, full time online poker playing 6+ games at a time and uses software to assist, based in Australia, bought his house outright a few y

I know a few, 1- Young guy, full time online poker playing 6+ games at a time and uses software to assist, based in Australia, bought his house outright a few years ago. 2- Retired guy who bets on local club matches, has encyclopedic knowledge of local clubs and is banned from placing bets by bookie chains. Pays people to go place his bets. Also plays poker. 3- Used to manually arbitrage Betfair but it took a lot of effort, was worth a few hundred euro per month as a hobby. Betfair has an API so might be worth looking at to see if you can find a gap.