A few points
First of all if there are PPL instructors it means they can't get paid. That is a completely seperate but important issue.
Personally I beleive CPL trained pilots even if they are bare minimum can provide better training than a PPL holder.
Before you lambast me I beleive I have qualifications to speak, ex Grade1 multi instructor, total around 8000 hours.
I may be experienced now but I dont have confidence to instruct as I have been out of it for quite a few years, I think the most up to date people are the best, and even green instructors are much more up to date and used to it.
I reject anyone comparing GA to sport RAA its completely seperate, if you want that go there dont push the policies here.
Its just my 2 cents worth, trust me I had many a student try to put me into a Vmca death spin but alas I survived! lol!