1. I watched a live coding session a month or so ago and lasted about 10 minutes (the first 5 I ignored because the streamer forgot to turn on audio) before I stopped. This is only useful for those who have enough time on their hands to watch someone code for hours at a time and can't find anything more interesting to watch. I just can't imagine sitting through this all the time.
2. For the developer who is streaming: You can get the same benefit (articulating your thoughts out loud) by using your cat, dog, infant or some inanimate object you can talk to (a Wilson volleyball, perhaps). You'll save tremendous amounts of bandwidth, storage space etc. and won't temp someone who should be making better use of their time to watch you so they can pretend they are doing something productive.