Scale
Another thing worth mentioning is the volume of arbitrated transactions at hand — a cut-off point should exist, below which no case can be filed. This addresses a vector of attack on the network, where arbitration cases are purposefully too numerous to be handled by anyone. Think arbitration DDOS.
This only works if the community is more or less equal. But it isn't. If we go to Africa and put EOS processes into the hands of informal workers they'll be facing cases of say $10. To them this will mean 5 days work.
Whereas if we look at the whales, they will happily DDOS the forum with cases above the threshold ... just to make sure it can't handle their $1mm case.
Life ain't so simple as the numbers!
RE: Tokenika's take on sustainable EOS arbitration