I don't think there are any other arguments to be made other than the two that have already been presented. With that being said, we'll just have to wait for the polling to be finished.
p.s. Encouraging people to vote for either side isn't cheating at all. We're not the only players with characters who would or could operate in Ame or Uzu, so we shouldn't be the only ones expected to vote. In an ideal world, both villages would get their own board, but I doubt that'll happen, so I'm willing to go along with this sub-board idea. I can't remember who proposed it, though.