I know this doesn't answer your question too well. In all honesty, the staff will only be as active as they feel they want to. Weening down, scanning through, and finding the ones you know will be active in the long term versus short term is one of the only people I found to work. Never add someone to the staff who has been on less than a month and posts a lot. It does show they are active, but from my experience they will burn themselves out, or simply get bored after a month and stop posting or start becoming less inactive. Instead focus on the person with consistency. If he's been on for a few months, has been making a decent amount of posts every day, and is genuinely helpful. That's the person you want for a long term, and active staff member.