User blog comment:Hidden Sniper/Riot's hand in the meta as we know it/@comment-4915885-20120924095710

I do agree with this all the way. Notice how they perform patch updates to change up the meta a bit. At one moment, Graves can be the best Carry, and then a patch comes and changes that, making him have more counters. You can also add on how frequently Riot brings out these plus Hotfixes. If people are doing one thing for a week straight, like Ap Janna, Riot will step in and say, "Have you fun? Good, cause it won't be here any longer."