An attorney shall not seek to avoid appointment by a tribunal to represent a person except for good cause, such as:

(a) representing the client is likely to result in violation of the Maryland Attorneys' Rules of Professional Conduct or other law;

(b) representing the client is likely to result in an unreasonable financial burden on the attorney; or

(c) the client or the cause is so repugnant to the attorney as to be likely to impair the client-attorney relationship or the attorney's ability to represent the client.