The girls you see are actual patrons. Most of them know each other and go there week after week. They dress slutty to compete with each other and tease the male patrons. (11:00 is simply when a lot of people decide to show up.)
Hookups are possible with some of them, but be forewarned: With the "easy" ones you will not be her first (or tenth, or possibly not her hundredth).
See my review of eCitie here:
http://www.outsidersDC.com/000/11237349801.htm
Pay particular attention to page 2 where I wrote, "... the place ... is an unashamed meat market. (If you can't get laid here, just commit suicide.)"
Happy Hunting.