Lets make an imaginary angry mob to knock at hoodoo's bird house!
Because it makes the game more fun... otherwise you only get all the farms in the North....
Let me guess, you've never had more than 10 villages, or at least not much more. When you have a lot of villages it's hard enough to find enough time for one world, let alone two. People will play multiple worlds at first, but then they will either get rimmed on one/more or they will actually grow. If they grow they will quit all but 1-2 worlds, and usually be less active on at least one. I have yet to see any big player play multiple worlds for an extended period of time.I can't see the opening of world 12 making that much difference on world 10 and 11 server loads, as i reckon that many will play world 12 in addition to worlds 10 and 11. Not instead of like the admins are hoping.