Instead of Riot working with the staff they have, they hire the amount of staff they'd need to roll back everything individually over the course of one month.
Riot could then earn back the money for reverting the game to the state it should be through the good will of the players, the fact that people actually have to buy skins again, etc.
It's nothing but good PR, and it would create tons of temporary jobs and do general good for everyone except the bug abusers.
Riot is literally being super greedy, and showing their ill will to all of the loyal players who didn't bug abuse. Of course they aren't going to do this. I'm not going to make anymore posts about this, but if you can think up a better solution let me know because I can't think of one outside of rewarding everyone to even out the playing field.