Larry Page's salary is $1...he is the CEO of google. "Salary" doesn't mean a whole lot, and coupling that with an APMA survey makes it even less meaningful.
I personally would trust MGMA and discussions with current residents, over anything the APMA published regarding income.
As far as OCPM's basic sciences, something is being lost in translation somewhere. Whether it is the large # of students, the curriculum, or the faculty, there is something left to be desired when you look at how their students fare on a standardized exam covering our first 2 years of school. Of course, unless it comes from a current OCPM student it is all speculation. And I'd guess that you will get different answers based on where the student sits academically....