I would say a large percentage of people who work in the non-profit space are already paid very, very low salaries and have accepted that as the reality of working for a non-profit. There are surely a lot of people who would choose to start their own non-profit and receive the same low-salary in exchange for the added benefit of having ownership over their work.

I think a lot of people join startups for the same reason, just with the added benefit that they could end up cashing in.