walkingthewalk, can't disagree (although I'm sure I saw a pig at 2000' today whilst I was teaching, it was a blue one I think!!)
The shame of it all is that the customer still gets charged a "dual rate".
This is, I feel, the crux of the matter. The student isn't getting a poorer instructor, after all we've all been though the course. But I'm bound to say that "professional" instructors may be a little better trained in flying skills.
I against and for, depending on my mood!