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Well, , a) my RfA was divisive and I barely passed, b) I've only been a practicing admin for about 3 months and, most importantly, c) as a clerk, I can see how hard the arbitrators work and how challenging it is to come to agreement with such a large group (over a dozen) members spread out over many time zones. 
It's a time-consuming, rather thankless responsibility and just becoming an arbitrator makes one a target for types who are anti-authority. So, if I ever ran, it would have to be at a time when I could devote time to it. I was looking at the history of the committee and I don't think there has been a term without one or more retiring early. People get elected and find out that it might not be the most rewarding experience. That's been my impression.  Read! Talk! "