You know, I've nothing against you or your site, I'm sure it's great....but in my newer days I used to sign up to so many of these directories that I'd see advertising here as start ups. And guess how many jobs I got, out of all of those directories combined, exactly none. So, now, I concentrate my time and efforts on the tried and tested advertising sources that bring money in. (I wonder how many of those directories are actually still even in business? One day when I'm bored I'm going to do that research).
Adultwork just have the monopoly on this market. Don't get me wrong, it's far from perfect, and it's not the be all and end all that some girls focus on it as (for me anyway) - I'd have gone broke a long time ago if I'd concentrated only on AW. But as far as directories go, it's really one of the very few that work, followed by paid ads.
If some of the ladies report back that they are making money from your site, or you climb the google rankings, then maybe I'll reconsider, but it's not for me right now I'm afraid.