Scrambler
Well-known
You never met anyone calling themselves an amateur neurosurgeon either. And therefore you never met anyone who calls themselves a professional neurosurgeon.I find the term 'semi-professional' photographer quite amusing. I've never met anyone calling himself a semi-professional neurosurgeon.
It's simply because after two decades of dedicated paid and unpaid pursuit of a craft, whether you are currently being paid or not, you have the necessary skills to claim simply to be a neurosurgeon.
It's probably a pity the same doesn't apply to the word "photographer."
Similarly, I've never heard anyone describe a lawyer doing pro-bono work as an amateur.