I fully agree with PPL's becoming instructors (as I've said, I was one myself) The fly in the ointment then was that it was a cheap way of gaining the magic 700 hours reguired to remove the requirement of having to do an expensive approved course for the CPL. What we need now is for there to be no advantage in gaining an instructor's rating on the road to obtaining a CPL, or maybe these days a frozen ATPL. Of course a few hundred hours of instructing gives additional experience, but this should not be a mandatory requirement as it was for all but the very rich then.
P.P.