There is an old adage. "Do what you love and you'll never work a day in your life."
I would alter that drastically. "Do you what you love, that isn't easy for many people to love
, and you'll never work a day in your life, without making a living.
I would probably be teaching people to fly or running a dive shack on a beach in the Caribbean, if it was simply doing what you love. Particularly, when the activity is filled with people that aren't really doing it for money, but rather as a hobby. Hobbyist's often accept a recovery of cost, not a return on investment.
Dylan, thanks for the primer on the economics of these matters. I found it fascinating.