I don't think that fully captures the situation.

My mother plants tomatoes in her garden. She invests a lot of work into them, only to get a few tomatoes a year. Clearly it is not an economic effort; clearly she is doing it out of passion, not for the actual value of the tomatoes.

However, imagine the plants stopped yielding tomatoes, and would never do so again. Would my mother continue working on her tomatoes? I do not believe so.

I believe that even if you are doing a craft purely out of passion, it is still important to gain value out of the fruits of your labor, be it ever so little.