A lot of those areas are unsuitable for someone to place a totem , they lack resources and land suitable to build on. I understand many people will suggest that not everyone will be able to place on or near junk, but I do not believe that is an adequate response to people desiring a location near a nessecary resource. Junk is going to evaporate very quickly when the game launchs and securing a location where you can harvest some of it is absolutely nessecary for a tribe.

Edit :
I have spent days exploring , so its not a question of me just not understanding what is currently available.