Worldsex's traffic is excellent, however you do need to know what to promote on it. I have heard of people who have ran hardcore galleries on Worldsex and made a killing. I would honestly recommend you try that if you still have galleries that are waiting to be listed.
Paid listings sometimes can be a crap shoot. I would recommend you contact Cybercat next time before you buy listings and ask Mark or Parney what niches work best on which sites. I'm sure they would be happy to help you out.
DH