Since CPAs are not required to belong to the AICPA in order to conduct public company audits, the most severe sanction would only serve to save the CPA some dues without any other practical effect.
CPAs are required to belong to the AICPA if they want to perform private audits.
mnli hypothesis: CPAs are required to belong to the AICPA if they want to perform private audits. premise: Since CPAs are not required to belong to the AICPA in order to conduct public company audits, the most severe sanction would only serve to save the CPA some dues without any other practical effect.