Because he's posting what they have...? At least Mumblez didn't delete all the extra footage (as the other guy did... oh wait! no, no! he has tons!
). I guess they always had the intention to save it for later but, sadly, they didn't make a real bts of each video. Sometimes it's awesome like Torture or Slippery and sometimes we get 12 minutes of sheets...
I still wonder what happens with the photos. They must have a lot of great outtakes. I know it's not the most popular thing, videos are better but, IMO, a pictorial per month wouldn't hurt anyone.