Okay, this makes more sense. I was mainly thinking of the second point—I agree that the first and third points don’t make too much of a difference. (However, some students can take on important jobs, eg. Oliver Habryka working at CEA while being a student.)
Another possibility is that you graduate faster. Instead of running a local group, you could take one extra course each semester. Aggregating this, for every two years of not running a local group, you could graduate a semester earlier.
(This would be for UC Berkeley, I think it should generalize about the same to other universities as well.)