I've done club dancing in
SL (though in gay male clubs, obviously) and the most important thing is interacting with the customers. Emote constantly, and that doesn't mean just press a gesture once every five minutes. Really chat with people. It gets them to feel like they know you better. If the club doesn't have a host/hostess when you're on shift then you (and the other dancers) need to fill that role, making sure that customers feel welcome, making them want to come back.
Never, ever say anything like "please tip the dancers" or "please show the staff some Linden love". Thats equal to begging, and is the quickest way to put customers off. If you've ever said that, stop. If you work with other people who say it, find somewhere else to work. Seriously. Its a huge turn-off for a lot of people.
Also being there three days isn't long enough. It takes a while for the customers to get to know you - the more you talk with them, the quicker that will happen. Another point - I was a customer of the club for several months before I started working there so all the other customers already knew me. It might be a good approach to get yourself known as a customer in a place first. That of course will mean attending their events and tipping their dancers. What goes around, comes around.
I was typically earning L$400 for a 2 hour shift, and I was by no means the biggest earner there, so it's not impossible to make good money.
And thats a nice pic. Put it in your profile, and make sure the rest of your profile is filled in too.