Quote sinply, ther are a lot of whackos, time wasters, and guys who fall in love every time, often before they ever schedule an appointment. The phone is reserved for legitimate clients who have booked an appointment otherwise, every nut who is drunk and lonely starts calling up with little intention of actually forking over some dough.
It's a business. A very personal pbainess and the acting and phone privileges is reserved for the guys who actually visit the gals.