I'm no expert, but I think you need to be a little more agressive with your affiliate program. If you don't have a traffic source prior to launching your program, then a good place to get traffic would be your affiliates.
That being said, on your back-end (through Epoch) you have no hosted galleries and no banners. It makes it difficult for your affiliates to push hits to you with no tools to work with.
Designs for gallery templates aren't that expensive and Epoch would even handle the affiliate code passing on those.
Those aren't gaurenteed solutions, but it's a good place to start. I hope that helps.
Oh, and a webmaster referral program wouldn't hurt either. You can set that up in Epoch as well. Offer like a 5% bonus if your affiliate refers more affiliates and that could help build your affiliate army. 