Fred Bauder said:
Sometimes we do, but sometimes we lose our nerve. Most of the arbitration committee are elected. Insisting on inclusion of unpopular points of view is not conducive to maintaining popularity. Announcing a high-minded principle is one thing, living by it - another.
Well it isn't as if you were being paid, or anything. :)
Seriously, I don't know why anyone serving on arbcom would be interested in serving more than a single term. It must be exhausting.