Microsoft have spent soo much on exclusive content for x1, the increased pre orders (which is still lower than ps4 judging by amazon best sellers) still have a long way for microsoft to reclaim their investment back.
EA: Peggle 2, PvZ:GW, Titanfall, Fifa in every pre order and Fifa UT Gold, battlefield timed exclusive
Capcom: Bought Dead rising 3 publishing rights
Ubisoft: Content only for division announced, Fighter within?
Activision: Continuing timed exclusive dlc for cod
Paying insomniac for exclusive rights to Sunset overdrive? Or funding it?
The cost of the cloud
They're likely spending billions. Probably why you're paying $100 extra?