If you were an instructor would you tell your primary income source to go elsewhere?
I think that it is a matter of working out just what is your primary source of income:
1) those that know they will get a license regardless of their attributes, or;
2) those who know that when they get a license that the standards that you instruct will stand them in good stead forever.
A very simple choice. VeeAny has it right.
cheers tet