Robert M Watson Jr
YouTube is terrible. Why would anyone buy a professionally produced DVD if they can just get stuff for free from YouTube? Eventually someone will rip the DVD content and post it to YouTube anyway.
I watch a lot of videos on YouTube (see my post from earlier in the discussion), and buy lots of videos (Ledyard, Amdur, Aikido Bridge Seminar...). Some teachers/schools post videos as a very effective way to promote their own videos or dojos.
And Matt - Glad you enjoyed the links.