There was a time not so long ago when accountants, attorneys, doctors, some musicians, certain ball players, the clergy and a few others earned the right to be called a "professional." But that was about it.
More recently, the dam burst and we're now flooded with professionals. Everyone wants in the club. It's as if just calling ourselves a "professional salesperson" is magical, lifting us above all those unfortunates, the "unprofessionals."
For "professional" to mean something special, something unique, something above the crowd, it requires content that's specific and concrete, a standard against which a salesperson's behavior can be viewed and measured.