Because a practice might have six doctors, but only three of them will be good, and they'll only work two or three days a week at the office and spend some time working at the hospital. And in a lot of practices, once you're signed on with a doctor, the other practice doctors won't see you, unless it's an emergency. I booked my appointment for March 20th back in January.
Our practice only had one female doctor too, and the waiting list for a new patient appointment was a whole YEAR! I had to suck it up and make an appointment with a male doctor in the practice. He's not that bad.
The nurses piss me off though. They're always so rude and assume I don't know anything!