Currently, there is no incentive to explore, as you just waste precious bullets on zombies, for no reward and little chance to find more bullets. It means people are incentivized to hang out at the loot points, such as police stations and barracks. I want to explore and not hang out at the high loot areas or server hop, but there is nothing else to do unless you become a bandit.
Military or police zombies should have a chance of a damaged pistol, sks, canteen, bullets or similar. Farmer type zombies should have chance of shotgun cartridges or similar. perhaps zombies could pick up a random item from their prey. Perhaps even some change of decent loot, like a rare akm, would make zombie hunting fun and rewarding, instead of killing fellow survivors to relieve boredom.