Guess I've got my head in the sand. I've never heard of this. I would never think of doing it. I would hope no one I work with (sales or instructors) would do it. Flat out unethical.
I have not heard of people paying off sales staff on the east. But i would be lying if i said i didn't get all buddy buddy with them and make sure they knew who I was and what I was good at. This and all my return clients is why I was the most requested.