It is desirable that mediator fees bear upon participants and encourage them to make progress. The temptation maybe to reduce your fees as a budding mediator, yet you will quickly realize that you will be working much harder as a mediator than in virtually any other professional capacity and that these fees are very much earned. Further, remember that you will have at least two and often more participants paying the mediation fee. Obviously, you will increase your fees with your success. In the short term, however, it is recommended that you do not under sell yourself.
People generally expect to get what they pay for.