I used to really like playing the PvP battles back in WoW when I was playing that. There were a couple of seasons where that was the only thing I focused on and I ended up with some really nice purple set rewards. It was definitely time consuming. We have an ESports team at the district where I work and thankfully they haven't started playing LoL competitively yet. It's mostly Mario Kart and Super Smash Bros right now.