Dude, if you are doing it under the table just cash, than I agree with JNN. I trained people for years. For under the table cash I would never go under $40. If you train someone for the $15-$35 range you may seem cheap and they will lose interest after a week no matter if they are seeing results or not. When they have more invested and they are seeing results they will stick around longer. I know this from experience, I have trained people from Orlando to Biloxi, MS.