XM:  You just don't "get it."  The confusion about the capital R Realtor is not unusual.  I tried to help you understand it.  It seems I've failed.  Members of the Commercial Association of Realtors are, to my knowledge, not ipso facto, members of the "National Association of Realtors" and, therefore, "Realtors" with a capital R.  Again, may I repeat.  A Realtor (capital R) is also a realtor, but a realtor (lower case R) is not necessarily a Realtor (a member of the National Association of Realtors.

Let me use an example.  All squares are also rectangles.  But rectangles are NOT necessarily squares.  Does that help?  If we were "face to face", I'd draw a Vin Diagram for you....that might help.  Realtor and realtor are NOT the same. Realtor (upper case R) is a subset of realtor, just as squares are a subset of rectangles.  

I trying to help you understand.  Don't get mad at me for doing so.  regards, Gary