It is wrong to require a CPL by definition of the PPL (PRIVATE Pilot's Licence). Hence a PPL is NOT a commercial venture.
The RAA comment was an interesting one. You've got instructors out there teaching students to fly aircraft in exactly the same places and airspace of those PPL's out there, in similar aircraft and shortly up to 760 kg's. These instructors don't have a CPL and in many cases don't even have a PPL. What is the difference?
Come the CTA endorsement in a couple of months and you'll have PPL's with RAA instructor ratings giving CTA endorsements to RA Pilots giving them almost identical privelages to that of a PPL, with the only limitation being Day VFR and one passenger only.
I'm on the fence, however I'm just raising some valid points!