Raiding world firsts

That's an interesting idea; I would probably also enjoy seeing those streams, at least the last few tries before a kill.
But it’s like someone already pointed out, guilds don’t usually want to share their tactics immediately, and the point is to have a live stream during progress. If that’s not feasible then the videos that top guilds usually post on YouTube and similar sites a few days after they down bosses for the first time ends up being almost the same thing.

I think the most interesting about this would be real live streaming of “probable” world firsts, there’s something exciting about watching something like this live, the trick is that competitors would be watching as well, or would have people watching to help them out on strategy and tactics.