I'm an L2, with no intention of going higher. It's pretty awesome indeed. :P
Yeah, it's L3 or higher. Judges can certify other judges to a level below their own. Judging under an L3 isn't really necessary, but HJing an event or two definitely is. And mentoring and certifying new judges is a pretty big chunk of what an L2's supposed to be doing, so you should know a thing or two about that too.