rPVE AFK

[Pyneappole 20]

I need gold for upgrades so I join a 4 player level 6 rPVE game (because I might as well get the daily reward as well). Then 1-3 players are AFK. Their orbs and wells are there, but they don't make units/do anything. Sometimes the leader of the group somehow "leaves the game" yet his orbs and well are still there. Otherwise they are still in the group/game. Is this some disconnect bug, or are people just afk to get the rPVE reward? If it's the latter, how do I get around this because I don't have the upgrades to sufficiently do more difficult rPVE.