Would you go to work and do your job every day for no money?
What an odd, judgemental outlook you have.
I suspect he feels that was because he does run (their job) every day for no money. I don't know a single person who does my job for recreation, even at an amateur level.
If you were paid to run, you would almost certainly enjoy it less. This is well-documented in psychological studies. When you are compensated for doing something, it turns into an obligation, and your perception of its intrinsic enjoyability goes down.