Duoing: the legal form of ELO boosting.
I'v always kind of had a problem with the Idea of duoing. Rarely is it two silvers playing together to try to get to a higher tier, but usually a silver and a Platinum or diamond player on their smurf.
I could honestly go and get my diamond 5 buddy to hop on his smurf and carry my shit ass all the way to high gold and honestly all it would take me is to not feed and sit in lane and watch him yasuo, or talon the whole enemy team to death.
It doesn't show that you have any skill.