Why does Riot even ban people?

Okay, so I got a ban for being toxic (yes I was), but that is besides the point, I have 10 accounts, all ranked. So you ban one and then I play on one of my other 9.. When I get down to 5 I create a new one. I don't spend a single penny playing this game and I don't mind playing with the noobs and owning them, makes me feel better. So really what is the point? You have to know by now that people just create a whole new account and all you are doing is making it worse for new players.
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