When I started Sahara's site below I had 2 sign up's within the first 30 mins of the site being live. Sales have continued steadily since then and re-bills since the launch on 13th Sep have been around 85%, so I think I have a winner
But... I'd had a beta of the tour up for a month or so, a Yahoo group and did a lot of other promotion before the launch. I have 65 affiliates and I just looked at their sales... This is an Anglo Indian models solo site and most of the sales are from UK affiliates

This is because she's on UK adult satellire tv 3-5 nights a week and so surfers in the UK get to see her for real which helps...
At the end of this year/begining of next year she has 2 hardcore dvd's being released in the UK, which hopefully will be out in the States around next April, so her popularity will spread even more.
It's down to who the model is and how you market her..