Re: Dojo loyalty or personal gain?
I strongly agree with Pauliina's statement above. I would also echo Ron's point but add it is also important that the energy you put out, you get in return.
I went through the same thing. I left because I wasn't getting what I wanted in my practice. I talked it over with the instructor because we have a personal as well as professional relationship. I still practice there occassionally and some of the people from there come and train at my club.
But my decision was not based on what other people did, it was solely a personal decision. Try talking over your feelings with the instructor and if you feel you still can no longer stay then at least you have been up front about the situation.