Currently this feature's only purpose is to make sure nobody wants to stay in a low pop server. This is terrible.
It also has no useful function whatsoever, as it is incapable of actually telling when teams are really not fair. Case in point, yesterday there was a huge balance problem after the whole Grey clan quit EU2 in mid round. One team had less than half the population of the other team, with at least 50 players online. Yet the system didn't detect that and winners got their multiplier. I'm fairly sure I have never seen "Teams are not fair" do something useful, ever. Please get rid of it, if possible.