Because we have 1 (kind of) main person that makes video walkthroughs on youtube. In the three (or so) years we've actually been consistently doing video walkthroughs, only Caleb or Mases have been doing them. Now, think about Majora's Mask. It took about 9 months or so for Caleb to create that walkthrough. 3 years divided by 9 months is about 4 video walkthroughs. So, give or take, we're actually exceeding what our goal should be at the moment.
Long story short, people don't seem to understand that there are 15+ Zelda games to choose from. When we do A Link to the Past, people complain that we don't do Wind Waker. When we do Wind Waker, people complain that we don't do The Minish Cap. It all goes round and round, and as Caleb has said, "Unlike Link, there isn't four of him."