Your Mastermind Course must not contain statements that a client will expect a certain income if they join your training. Promises of individuals attaining a certain monthly income within a certain time frame of joining your program, are prohibited unless you can prove that the typical participant can expect that result. For example, a claim that a client could make $10,000 in two (2) months of joining your program is unacceptable unless you have documented proof that typical students see similar results.
Since you do not know how a client will utilize your service, you will be unable to predict the outcome. The result you should focus on is helping the client learn the skill you are teaching, not a promise of certain income. This is a narrow-minded approach that solely focuses on one outcome, which is unpredictable. Avoid making earning type claims.