Well 99% of the views come from competitive games being played online. For example, there are less than 40 people watching Fallout 3 as I type this, but over 12

Well 99% of the views come from competitive games being played online. For example, there are less than 40 people watching Fallout 3 as I type this, but over 120,000 watching League of Legends. So you're right to not get it, because that's not really something people do. When players do watch a streamer play a single player game, it's usually because the game has recently been released, and they want to make an opinion on whether or not they should buy it. Or because they enjoy the streamer's personality and commentary. They're not watching Fallout 3, they're watching TotalBiscuit play Fallout 3.