Out of the photographers you have met in person, how many do you believe ran full time legitimate businesses?

Ive been thinking about this as Im doing my end of year finances and came across all of my gear sales and purchases. Very very few people I have bought or sold from want me to draw up receipts and/or proof of sale/purchase type things.

And most of those people are, like me, videographers first and photographers second.

Which led me to try to think about all the people Ive met in my ~16 yr career who were verifiably full time professional photographers. Very few, it seems.

Just an interesting observation