IBM sells mainframes and severs with locked processors. Physical hardware that are in the box you own, but locked until you pay for additional processor licenses. It is ok for hardware because it saves the need for modification and or replacement by technicians and admins, risking error. An unlock in firmware is simple and clean. Not the same thing for On Disc DLC though. The deal with dlc is more like, oh it's easier to cut out existing content and resell later than to create new content. It also lets them spread out the sales over time to keep up a player base.