User blog comment:Saratje/PC release date explained - Skyrim: Dragonborn DLC/@comment-4269579-20121230031418/@comment-4057437-20130104043615

If Bethesda thought they could make more money by not giving Microsoft a period of exclusivity, they would not have signed the contract, Anon. In the end, the only control Microsoft has over Bethesda is through money.

That being said, the extended delay of the release of DLC's for the PS3 isn't due to Microsoft's money, rather, it is due to technical reasons. Bethesda is losing money and, in the long run, PS3 customers for any future games, not something they want.