...Are we sure Ellen doesn't know how to be evil?
Anyway, yes, Marik the Cleric started monologuing, but heck, I've wanted to ramble on to anyone and anyone about some cool thing I did in a video game before. Imagine if you had a whole evil scheme! You'd want to tell SOMEONE!
I mean, you shouldn't.
But you'd WANT to.
(And it's convenient in stories because now your audience knows what's up, too.)