I'm not a program owner but I have also wondered about the result and effectiveness of this type of promo.
I was going to throw in what Easton has already said about naming galleries in the perfect mumerical sequence also.
I have been with 2 different groups of people in 2 different continents when the subject of surfing porn cropped up and how there was never a need to pay for porn. People were saying how easy it was to find one of those link sites and then when you find something you like and want to see more just change the numbers in the address bar and you get more. There's about 30 people right there that know what to do.
I'd prefer to keep it all limited myself rather than just have it all tossed out there.