I play as a sniper for my group and act as an overseer/ defender from high-priority targets such as other snipers and nearby players so my group is under the least pressure possible, and knows where it is coming from and when from my reports. Sniping zombies is not a good idea ammo-wise, but to take out other players is a whole other story. Whenever my group heads in to loot a high-pressure area such as an airfield or a city I always find a sniper spot and assist them from afar. Also, if the whole group dies than I can snipe the killers and defend their corpses until they can get back and get their stuff.