Yeh, it is strange that photographers seem to search for this title more than just about any other profession.
My barber does not call himself a professional barber. My dentist does not call herself a professional dentist. My doctor is just my doctor. My burger flipper doesn't call himself anything. My mechanic is just a mechanic.
All professionals of course,. and even if the mechanic is developing a bad reputation, overcharging for poor work, he is still a professional.
Me mum is the best cook in the world,. yet she's only ever been an amateur at it,. meanwhile there are many many many professional cooks that are not very good at all. (Even though they have much better kitchen equipment )
It is odd.