I think that for Rich people, the more important thing is that they understand how accounting working, they understand the "language", and the facts reflected by the numbers.
It just like doctors' case.. Doctors Specialists earn much more than regular family doctors. Family doctors with their own clinic earn more than doctors who work for others.
It all depends. CMA who are working in those Top Worldwide 50 companies as a CFO still earn more than CA who provide services to local people.