Generally every couple of games I get an AFK guy trying to get a free cache.
It's feasible because you can only kick so many people and the timers on when you're allowed to first kick someone normally doesn't end until 3 people can split kill 5 bounties.
Today I joined a game, did a bounty, noticed there were 3 AFKer's in the Survivors Enclave and was forced to leave.
The AFK Kick System needs to allow kicks earlier and more frequently. I know Blizzard was originally afraid people would abuse it and kick too often, but the opposite has happened and the restrictions have encouraged people (possibly even simple bots) to go into a game, sit afk in town and get free caches without fear of removal from the kick system.