I am not sure I accept the proposition that moderation staff who are paid will always do a better job. Unpaid moderators do it for their various reasons, one of the most common I've seen is a deep passion for the topic. Being paid to do something changes that dynamic incredibly. The best moderated forum I ever was a member of was done completely on a non-profit basis. There were paid competitors, every other site in the niche had some sort of monetization, except this one. The mods loved the area and were deeply respected in the niche. The community was strong. They eventually did quit and sold it to a company, the site died nearly instantly with a paid staff taking over.