I have only seen ppl booted for this once. It was after a boss kill and the normal few ppl drop so as we cleared trash to the next boss somebody needed the greens. Since there was a rare downtime in combat as we waited to fill back up the group kicked them. Normally you are too close to just finishing combat, in combat or a loot roll is going on so you can't kick anybody. This is one of the reasons ppl do it. I wouldn't vote to kick them but I have no issue with ppl tossing whoever more or less steals from the group if they want to.