This is something I've never understood the purpose of. A good example to cite is Beau recently locking Mrkoreanguy's Masturbation guide
. Just what did that accomplish? Do you for some reason not want him to make that guide? Do you want to not hear other people's insight? Maybe other people want to, yet it still got locked. Couldn't the moderator choose to just not look at it?
Another example to cite is Tom locking his thread telling people to post Minecraft threads in the Minecraft forum. Just because he didn't intend for people to respond to it, what disadvantage does it create for you to keep it unlocked?