I think solo girl sites are like cam sites they will convert if consistent updates and interaction from the models which is the reason I generally pull solo girl sites once they stop updating and giving me promo tools. I'm signed up to quite a few programs in ccbill but don't use maybe 30-40% of them as they no longer update, a few of the programs I like with updates like clockwork...
Latin Teen Cash
Nikkis Cash
Spunky Cash
Precious Cash
Hot Teen Cash
Wet Peach Cash
I Heart Bucks
non updating sites may bill but your chances of rebills are higher if the girl is active so the reason I only try to promote live updating sites.