What is the purpose of the ropes tied on roofs?

Once you reach a certain point in the game, you can freely travel around the campsites gathering any missed GPS caches, relics, documents, etc. In some of these areas, the Mountain Village specifically, there will be more enemies, as well as new, helpful objects appearing in your Survival Instincts.

More specifically, there are some grounding points for rope lines scattered about, generally with a direct line of sight on the roofs with the rope coils. You can fire a rope arrow into the roof, ground it to the pole, and enjoy some ease of travel around the once hard-to-travel Mountain Village.

Sadly, that seems to be the only use for those roofs. Minor, unnecessary rope-lines, and annoying golden glares in your Survival Instincts.