I've just taken over the running of the local club, which is now run as a non profit organisation. All instructors do not get paid, we do it to keep the club running. The grading fees are £10 this covers the cost of the hall rental, belts and certificates. Sometimes guest instructor will attend for the gradings. It is very hard to define what should be charged and what people will pay. Are your gradings open or closed (Parents allowed to watch their child)