You can play it on another account with out purchasing it? I can't

Yes i can by utilizing the 2 controller technique. I am on Xbox360, and it allows the secondary account to play. But this is all a tangent to the initial post from kara182 which states: "BUNGIE JUST TELL US IF EACH ACCOUNT NEEDS TO BUY THE EXPANSION, THATS ALL WE ASK" You answered "Yes" as if you were Bungie. Your answer is incorrect because of the EULA (end user license agreement) which states that content purchased on the console is shared among all accounts on the console. Now, it could very well be, that through some legal mumbo-jumbo, Bungie in the end could circumvent the EULA somehow. At that point, your answer could then be deemed "correct." If, however, it's a glitch, or they are forced because of the EULA to comply, you will then have given an incorrect answer to a person who has now wasted money unnecessarily. Better to err on the side of caution, and not give an answer you don't really know for sure is true, and cause someone financial harm.