All Forum Lurkers Please Watch This Video. in Off Topic
"The more helpful the post on an internet forum, the less readers. Those who can be most helped by a post simply will not read it. This fact is even more true when said post is a sticky or an announcement."
In other words, sticky posts indirectly create barriers to participation...
Which would give the mods free reign to delete all those "please build my anime game for me!" posts.
In short, stickies are like any other tool and can be effective if utilized properly.