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There's an upper-limit to the number of bouncers you can hire before it starts being unprofitable, and from the article it appears that -- even when they charged a cover -- they hit that limit.
It sucks when a bunch of violent white thugs spoil it for everyone else, but then again, maybe if the violent white thugs weren't tolerated by other white people (i.e.self-policing), then white people wouldn't be excluded en-masse.
Generally the solution to problem customers is bouncers and in more serious cases police, sounds suspicious.