Being a freelance photographer means you work for free

Grey

Freelance means you work for free. You get paid if you produce. Peter Parker only got paid for pics of Spiderman.

http://www.dictionary.com/browse/freelance
"Also freelancer.a person who works as a writer, designer, performer, or the like, selling work or services by the hour, day, job, etc., rather than working on a regular salary basis for one employer.
a person who contends in a cause or in a succession of various causes, as he or she chooses, without personal attachment or allegiance."
No they don't work for free

Agreed. But they don't get paid until after their job, like a prostitute.