Because I don't have the ability to Stick threads. I did mention it to some staff members a while back, but for some reason it wasn't pinned. Believe me, if I had Staff privileges I'd probably have attacked the Sticky threads as my next major project after finishing up with the Archive, but for some reason this is a project nobody else has seemed willing to let me actually get on with.
Thanks for the vote of confidence, but it's really out of my hands. I'd really like to be able to take a few good days to sit down, clear up the stickies and get the forum looking a little more presentable, but the point relies on a few different factors.
If you'd like to discuss things more, I would recommend posting in my File Archive Work thread - suggestions are, as always, certainly welcome.