Why even bother reporting?

Dear Riot. What is the point in reporting people? I play ARAM and all I hear from people is that it's a waste of time reporting people in ARAM. Why is this? I've reported many people for really bad behaviour and in one year I've had one notification telling me that somebody had been punished? It seems your system is floored. Why do people think its a waste of time reporting in ARAM? Hopefully somebody from Riot can comment. Thanks
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