Most models dominate their way or I would not doubt blackmail to win
To easy for models to abuse that paying members make the free sever possible
But most models have horrible attitude thanks to the site not paying its members or holding their pay
Tip for consumers: I suggest not spending anything less then the direct bank deposit and get a model that is willing to go half way; Free cam2cam , skype or gtalk etc to keep in contact and non nude striptease to show their affection.
You don't want to help a model reach their cut of goal just so they can use you again; get what you want.