That’s the very, very low end and not quite what defines it.
Here’s a story on concierge.
http://physiciansnews.com/business/204.kalogredis.html
It is what is defining it here in St. Louis. These are not "low-end" doctors. The Doctors listed in this article are thriving. They have been joined by probably 6 more in just the last 6 months in a relatively small area of St. Louis. No, it is not the "spalike" offices of M2D ($20,000/yr). It is a regular doctor's office with 1/3 to 1/4 the volume of patients seen.