I'm using logic to deduce the reasoning as to why Bungie would accept an exclusivity agreement. Why would you take money from one company if you could work with two companies and make more money? Obviously, someone at Bungie did the math and determined they would make more profit through an exclusivity agreement. Companies don't withhold content out of spite, so what other logical reason could you have for withholding content? There aren't any. There's only one logical reason for such a move and it's profit.