I kinda wondered if it would be useful but a few things stopped me:
1. I'm still a relative beginner so I'd prolly do or say something wrong
2. Some of the videos could be quite long and rather boring although you could edit out long sequences of soldering a bunch of the same component like FS rj-45s or LE dip sokets
3. Youtube limits the video length (but I guess other sites may work like Vimeo with some caveats)
4. I hate the sound of my voice like most people