Sony is well known for avoiding cannibalization of other divisions to the point of shooting itself in the foot. E.g. the PS4 doesn't have a Blu-Ray drive because Sony also sells Blu-Ray players at roughly the same cost at the PS4 (keep in mind the business model for the PS4 is to sell at a loss and claw back profits on the games)
The XBox pays royalties for it's blu-ray drive - and a significant sum goes to Sony who it part of the Blu-Ray consortium, go figure!