Actually, the ones on the edges should spread out a bit, they will reduce the competition for those coming from the ends of the beach who will now have to walk

Actually, the ones on the edges should spread out a bit, they will reduce the competition for those coming from the ends of the beach who will now have to walk further to get to another shack, and they still split the difference between themselves and the next shack. How MUCH they should spread out and what more competition will do is unstable.