Another idea..
You make galleries which up sell Regular AVS sites.. Whether AC, AV, CA, NV or one of the many others that are around these days but AdultCheck have just opened
http://www.acfree.com The idea is they host galleries with their content and you then have banners that link to your Regular and Gold sites.
Then your Regular AVS sites up sell your Premium sites.. Which in turn up sell your own pay site..
So: Gallery ---> Regular AVS ---> Premium AVS ---> Pay site
You can make as many galleries as possible all optimised for SE's and get them on TGP's or links lists as well..Also.. You should have at least 10 Regular AVS sites for every Premium site .. I have 23 Regular sites at AC and they all upsell my 4 Gold sites specially on the tour and I find that a lot of surfers then have a look at the Gold sites and sign up there instead of the Regular..
Just my UK 2 pence worth