Who's going to manage/ oversee the whole thing? Every night. And not have a liver like a football in 12 months (a stereotype of bar owners, I know).
And security for when the roided up aussie muay thai dickheads get a shit-faced and want to punch on with everyone.

Good for you for having a go and I hope you make lots of $$$.
For me bars are places you go to, too many of them around and they go hot & cold and the custom disappears.