Not sure if this OP is from getting up on the wrong side of bed, or just trolling. Likely the latter. But why would you possibly care? Someone who is listing their professional credentials is, presumably, not also listing their B.A. or M.A., or whatever. Some clients, advisors, etc., etc., might not recognize what a CPC means, but they might know what an ERPA means. Etc., etc., etc. - where's the harm in listing them? If no one is interested, the eye skims over them.
Have a nice day.