How can you be greedy?

Greed is actually a fairly complex notion. It is never satisfied. It wants more than it is allotted. It's usually personified in the pursuit of money, but it could apply to anything. It is a means to an end and is usually accompanied by many other undesirable traits (selfishness, lust, narcissism). So for example, say your evil angel has a girl, but wants the other guy's girl too. He tries to woo her away, but the girl is too lovesick. So Mr. Greed devises a way to get the guy away from the girl and have her to himself, and that includes defending the guy before Satan (who possibly wanted to kill the guy in the first place, but is now convinced to help him get a job promotion in some far off location in the country). So Mr. Greed would be appearing to help the guy while hurting him at the same time.