surprisingly when I was in Japan in a maid cafe like this, most people didn't even look much at the waitresses, they kinda got used to it, but on the other hand, the atmosphere was so relaxed that you could just melt away.
Background music was loud enough to shut out people talking but also silent and soft enough for you and your partners to talk privately in peace.
And yeah, like froody says, one unwanted move, and you and your partners (people you come with) are booted and forbidden to come back, say what you will, but this is a kind goodbye, cuz you could have ended up on the police station for sexual harassment.
That is why this kind of business is difficult to keep up, you need to watch over the shop all the time, but the profits are rewarding, and there are more rewards to this as well, a well kept place gains an unbeatable reputation, I think even gangsters wouldn't mess with stuff like that.