Wanted to second what the Jamster said. The PO from Hayward/Emeryville and now Concord has called me several times. Usually works out pretty good. She knows I like young newbies. She called yesterday, I saw the girl, college grad. just here from China for language school and needs money. First day ever working. I had a good time.One thing you have to remember is that the PO is trying to attract pretty girls. This helps their income. To attract better talent, the house has to pay well. These girls talk. If the house is slow or has crappy clients (ghetto, poor hygiene, crappy tippers, etc..) it is harder to get better talent.
If you establish yourself as a good customer, you may well find PO's calling when special talent is around, or at least PO's that will give you an accurate 411 when you call asking who they have available. As a monger, I value the special PO relationships I have out there.
Finally, that hayward/emeryville/concord org. I feel is a very unusual place. Except for Concord, very dingy places. 4/5 times if you show - up, they have MILFS. But that PO has a nack, now and again, for getting girls from Taiwan and China, here with one month Visa's, Business Trips, etc.. that are non-pro's who can be very fun.
Don't shun preferred client treatment, embrace it.