Many bloggers get targeted by gits who like to pile up abusive comments on many posts, even when they know they’ve been put into permanent moderation, because they get a kick out of the idea of the blogger(s) reading the comments anyway. It’s hatespam. If you have email notification for posts in moderation, then you get the abuse sent to your email, a thought which they also love. It’s a particularly insidious form of cyberbullying, with the goal of intimidation and silencing of voices that bother them.