I'd gone over this in my first post, but then I modified it to have all the download links and update information, so it got lost. Sorry.
If you expect people to use a brothel like a brothel, then try a different game, friend. This is an underworld game. You're dealing with gangs, slavery, prostitution, turf wars, and more. Son of a late underworld boss or not, you're still new to the scene. So there's a few hoops you need to jump through to get started.
You're not publically running a brothel. You don't want the authorities to really know what you're doing in the back rooms. When the authorities get suspicious that something shady is going on in that bar of yours, they raid the place. So you want to keep the place as low-key as possible. The bar acts as a front, and as a screen. The Average Joes that come in to get drunk never know there's more than a bar, that there's a casino, sleazy bar, and brothel in the back, but those people that know to ask the right kind of questions will start to figure it out, and as your reputation increases you'll start to attract those kind of people. Advertising isn't so much telling everyone that you have a brothel, but rather greasing the right palms to get the word around to the right people.
I liked this concept in EX, and I implemented it in my game. But I smoothed out the transitions so we wouldn't have the problems EX has, where suddenly you have customers showing up in new areas and need to send girls to cover the new areas, but by the time you get coverage the customers have stopped showing up there because they didn't get service last time, and then you need to pull your girls back to the other areas that are short staffed because you sent them to cover the areas customers stopped going to. Which means that customers stop going to other areas because they were unhappy that you didn't give them good service, and once you get everything settled out again the cycle repeats.
As for the number of customers a girl can take care of... there are stats/skills that govern how many customers a girl will be able to take care of, and stats that govern how well she will do at the job. If you want a girl to take care of more customers, you need to figure out which stats are important for the job you're having her do.
The current build is something of a beta. I've released what I've done so far so I can find out where the bugs are. But I'm still working on the current jobs, and they will be more finished in the next release. In the future, jobs will increase stats, and apply/remove traits. They will also modify customer happiness based on how good of a job a girl did. Currently only the whore jobs modify happiness, which will be fixed in the next release.