I agree, killnets should go. They are nothing but non-discriminating walls of death.
I disagree that most of the overage gets discarded, unless they have an observer on board or the EP's are out in force. The overage is what they like to call "rough cuts", quick hacked filets that are done by the crew and hidden on the boat. I'm sure they don't all do this, but most of them do ex the ones that my friends work on. I've talked to them about this in the past and it is a common practice. Not to many people out there that would throw a few thousand dollars overboard.