I know it's a popular phenomena, I figure most people do it for the Ecelebs more than the games themselves at this point. I personally don't really enjoy watching streams since I'd rather be playing the game itself. Though I could see where someone might watch it if they're super interested in a given game and want to see the story start to finish.
I like when people watch me though, like it's a group activity and it's a little less lonely. But most times I put up a stream of my gameplay no one will really find me. Usually it's just my girlfriend. What about you guys?