I sincerely respect the work you guys are doing.  This is not a diss.  Just an idea that would not really take that much time, but would help sell.

Write a script with a pre-generated map (so you know every item/monster etc. that will show up), and have either a woman, or someone that has a voice thats not like mine or yours read the script.  We're all nerds here after all.

You could pre-record the video without saying anything (if you do it slow), but have someone else (preferably a fallen enchantress) do the talking.

The video was 18 mins.  If I didnt know anything about the game I would have no idea what you were doing in that vid.

Just constructive thought.  No harm intended.

I picked up Minecraft the other day and the Wiki link has the funniest sounding Brit ever talking about everything in the game.

Cheers Mate!