It's enough for him to live on. He probably earns more on Twitch, it's where most of it comes from probably, but YouTube's money isn't as bad as you think. Look at the amount of videos he uploads: In the past 24 hours he has uploaded around 11 videos all getting around 1 - 3 thousand views each. In the short tail, based on YouTubes standard cpm rates he'll only be getting about a dollar or two per thousand views (that's what mines is roughly). So that means he could earn around $20-$30 every day if he did that every day BUT that's not it. There's the longtail, the bigger videos, his entire collection. They don't stop getting views, they just don't get that initial mass of views when it's fresh out - but they all get something, and all those smaller somethings are still monetizable and they all add up and make a nice addition to his paycheck. YouTube money isn't as bad as some people think.