All PbP games will need to be approved by me before beginning. I'll be frank: I'm not sure of the reasoning behind this, but almost every PbP site I've seen has a similar rule and it's obviously there for a good reason.
Update 11/19/13
It's suggested that a PbP player spend at least 1 month playing in a game before starting their own. This isn't due to any specific member's behavior in any way, it's just a question that was brought up by a mod. (Does not apply to ConditionTracker's Rotten Eggs game).