Even if the client is hot enough to do porno why would a famous pornstar do that and risk so much?
Agreed but I think @herbertfreimann means that someone who already does porno even if he doesn't openly advertise might be able to see client he screens before for a certain amount of money.
How interactive the pornstar would be with folks who don't look like fellow pornstars and whether his clients are satisfied or not is whole different question.