Oh you can gamble just fine, in fact that’s how the clubs support itself. Best brawlers work for the house so the potential pay-off gets plenty of folks betting against the house hoping to win big, but they often don’t. Doesn’t stop people from trying though. Naturally of course there’s also an admission fee and concession stand, so it’s not just gambling that supports the club. And it’s not like these Fisticuff clubs are underground or illegal: they they definitely don’t happen in the public eye, it’s not unusual for guardsmen to be gamblers or even fighters in the ring. As long as there’s no murder (accidents happen) and no one is being forced to fight, the it’s all hunkydory. You know, aside from the frequent broken bones and lost teeth.