that site is a joke, they don't return emails, i have my doubts half the girls on there even know they're listed there. Many of the girls are with real agencies. Others are Internet amateurs you can find on their own sites.
All of these model listing places are lame, try to get a model to return an email. Maybe one in 20 will.
http://www.adultstaffing.com <---------- a few people have told me that they have hired girls from there sucessfully.