The thing that makes watching a twitch stream so entertaining is interaction with your viewers. If I wanted to hear the drone of the bot lab I would just open up RA2 myself. Without host commentary and/or facecam you're mostly wasting your time.
Well, when I do it, I do interact in a sense, the fact that I just build random rubbish is the fun bit. Test it and all people just laugh at it.
I've been getting good reactions from people.
Keep in mind also that this isn't the only thing I do on the skypecast. I usually stream all the Tetris matches that we do.