No idea how many people do this, but there's at least one right now.
User with auto-approval + deletion rights uploads a picture, spots a flaw afterwards and deletes it.
While it sure is a nice thing, it'd be even nicer if it was simply flagged so that other approvers can have their say about it.
Someone else may have wanted to upload this post despite the flaw, and you wouldn't outright delete it in this case.
One man upload is another man's potential steal, etc.
e: derp, typo.
Updated by user 287254