Some feedback for you after just a quick look around...
Being able to accept payment via Visa is very important if you expect any affiliate with significant traffic to promote your program. Having cascading billing with several processors who can handle all possible methods of payment is what's needed to get serious affiliates to sign up for your program(s).
It looks like there are two paysites and two separate affiliate programs. If that's the case it'll also work against you. Just having to sign up twice will turn off some prospective affiliates. But mostly it's knowing they'll have to hit whatever your minimum payout is on each program separately before they can get paid.
I didn't sign up so I have no way to know how long your tracking cookies live, but that could also be working against you if they have a short life before expiring. Particularly since it looks like someone can register for free on the QueenslandGirls forum, and potentially hang around there until they're convinced to join after the cookie's expired.
Another issue is traffic leaks on your tour. For example the large buttons linking to Facebook and Twitter at the bottom of the QueenslandGirls tour pages. Also the buttons six buttons linking to review sites.
The hosted galleries for QueenslandGirls I saw seem to try to get someone to go direct to the join page after seeing only 7 photos without seeing the tour first. (And just for your own good, you should note that all of the links on the gallery which go through Zombaio will generate an error message if there's no affiliate ID, effectively keeping anyone from getting to your tour or join page).
One other thing that may hurt you is that your monthly price of $14.95 means an affiliate will only make $7.48/$8.97 per signup. And on QueenslandGirls you're offering a second month free, so there can't even be any rebill income for 60 days. And affiliates know that many members will have canceled by then since there's not a lot of content on the site yet.
Finally, your tour pages aren't really designed to motivate an interested surfer to become a members. The two sites have very different tours. But both are short with no or only one video preview and there were no links I could find to see large photos. Affiliates know it takes more than what you're showing to convert most potential members so they'll be reluctant to sign up for your program and send traffic to those tours.
Anyway, that's from just a quick look around, which is all you can expect the majority of affiliates to take before they make a decision on whether to promote your sites. So to get back to your original questions, yes, Visa and the right processor(s) are important. But you'll also need to pay some attention to those other issues if you want to attract affiliates who know what they're doing and can send you any volume of quality traffic.
With all that said, welcome to the board and good luck with your sites and your programs.
ADDED: Check the links to the tour, join page, etc. at the bottom of your StockingHeelSluts galleries. They were all 404 errors on the ones I previewed.