At my old company we were paying millions for contracts and software we didn't use or really didn't mean. One of the analysts volunteered to be the "undertaker" and renegotiate. After a year of screaming at people on the phone (I sat next to him), he managed to save us around a million dollars, which was around a 60% savings. He pocketed maybe 30% of the money saved that year. Not bad for a year of being a dick.