But just how many LP have you gotten from the other team's AFKs?
I've noticed people like to complain a lot about AFKs in ranked and losing LP. However on the flip side of the coin the other team is getting the AFKer just as often as you are (unless you specifically are so toxic people AFK to avoid you). So I never see people be happy when they get a win because the other team just lost a 4v5. TBH I kind feel bad for the other guys, but I realize it's 50-50.
So even though I wish there was something more to be done about AFKing, like early surrenders or something like that, people really shouldn't get as bummed out about it as they do. Remember for every LP you lose to an AFKer, you are probably getting one for the same reason.