I was a manager of a non-profit quilt store..I was paid 1/2 time but often took work home that took up most of the night. The store ran mostly with volunteers in a very rural small town. If i would have been paid full time and sales persons would have been paid, I don't think It would have survived. It still exists with a manager and associate and many, many volunteers and the non-profit owns the building.
So, I agree with your posting.