The only pay we get is the kind words from the members
Andy R. is the owner of the site. He owns a number of different sites. If you go to the bottom of this page on the left side you will see a blurb that says:
"Other Social Knowledge forum communities" and then lists a number of links. Those are Andy's other sites.
When we feel there is a need for a new moderator the Admins (Alix, Kitchenelf, and myself) will have a discussion. We will decide if there is a need and then we will discuss who would fit the need. We usually run this by the other moderators as well for their input.
There are a number of factors that come into play when we choose a new mod. Among the reasons are things like familiarity with the site, fairness, physical location (we like to have mods in all different time zones so there is usually someone on who can help members at any time), how they interact with other members, an interest in being a mod, which often times means less participation on the site as a member and more behind the scenes work, and many other things.