You used your refferal code (the bit after the question mark), which usually means you get some kind of reward when people follow it and sign up, it looks suspicious for your first post.
By sweeten the deal, I mean take less or no commission from them, perhaps for the first month or until you feel you're established enough to go for a profit. An indie may be successful but not getting all the work she can handle, in which case she'll be willing to consider methods of increasing her exposure, I used to do some work via an agency when there was one in town that I liked. The more money they get from each booking the more likely they are to accept your offer. You may well get some with your regular rates (20-25% is pretty attractive), but you'd undoubtedly get more with lower rates, so you might decide it's worth it for the sake of having some good girls on your books when you launch.