Some questions contain statements like "will upvote everyone who provide valid code".
When hovering over the upvote icon of an answer, I see that SO believes it should be pressed for a "useful" answer.
I personally think writing sentences like the above imply that the writer is not going to respect SO rules about voting, and should be edited out, although I don't think I've ever seen sentences like that being edited out.
Added: Or is it that the original author can define what he finds useful?
Do you agree?