Penalties for players that ruin the game

Here's an Idea, if 4/5 people on your team report a player for the same thing (Inting, afk etc) the 4 people don't get a LP penalty for losing the game due to an obvious disadvantage (4v5). Then Riot investigates the matter and deals the reported player appropriately. Just an idea, feel free to constructively criticise or full poo poo on it.
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