So what is a professional trainer? I guess any one who call himself a professional trainer implies two things.
One is that he has achieved certain standards. These standards could either be set by industry groups as in professional bodies or by legislation if any. There is no one organisation in the world that sets such standards. In the case of Certified Professional Trainers program offered by the Quest Group; the standards are set by the IPMA (International Professional Managers Association), U.K. There are other organisations and therefore the value of the certification would depends on the reputation and the coverage of the awarding body.
The second implication when you call yourself a professional trainer; it means that you can and will be earning a fee in that profession as oppose to earning a salary. You will be available to be engaged as a trainer by potential clients. If you are earning a salary as a internal trainer in an organisation; you will probably be referred to as an in house trainer rather than a professional trainer.
Why am I talking about this? Well, there are organisations offering programs to train people to be “professional” trainers but are run by trainers who are employed and has questionable success as professional trainers. So what do you think?