Well they're fairly expensive for one thing, might be why you're not seeing a whole lot of rebills.. $35 is a lot of money to regular people..
I'm sure it's worth it with ls-university.com and those, but the "single-girl amateur" ones are also 35 bucks as far as I can tell.. I don't see how a lot of peeps would be sticking around month after month on these, even with all that bonus stuff they throw in.
Nina's site almost doubled in price since she went with them, would be interested to know how her old fans reacted to that, or if they're still paying the old fee.