Good point. The gripe is, as an example, a small tribe wants to have it's area covering junk and water. A homestead is 140 meters away and the tribe cannot place the totem to cover the junk/water. The tribe moves back far enought to be able to place a totem but no longer does the junk/water fall within their radius. If the tribe grows enough in size over a period of time, it will engulf the junk/water desired, if it remains moderate in size, it cannot claim the junk/water within it's boundries, but no one else can claim that land either.
Allow a tribe to use the land that is reserverd, rather then have it (the land) sit there wasted on the hopes a tribe grows large enough to fill the area already reserved and wasted.