Thanks Vikki. Much what I was expecting. My point is simple, you yourself admit to not singing any Rock or Blues etc. Most vocal teachers fall into this category. They know only the classic styles and techniques and use only them. You do an excellent job doing what you do and I am sure you are a genuine honest person. I do not dispute that you have taught tone deaf people to sing better. You yourself must admit that you can only go so far with folk before you reach their limits and the rest is down to them and natural talent and application. These facts are not in question. However with no experience of the genre of pop/rock how can you teach someone a style that is so opposite and alien to yours?
Just because someone does not follow or adopt your own musical standards, ethics and philosophy does not make them wrong or a bad person. I would not dream of trying to sing in your style as it is so alien to mine. However I can still appreciate the techniques which are so opposed and different to mine.
Listening to any classical trained singer trying to sing rock is an experience I would prefer to miss. It is almost as bad as a rock star trying to sing opera. The two styles just cannot mix as they are so different.
There is more than enough room in this world for all the styles of music we have. There are some thing you cannot really teach and Rock is one it is just a natural thing, not contrived.