Even if there is duplicated information, when I am looking at running campaigns, I need to be able to incorporate elements from the Rebels and Imperials. Just because you don't have any characters running Duty instead of Obligation, doesn't mean you aren't going to have your players interacting with either Rebels or Imperials (or both and having to choose... best option). Allow them to buy some of the weapons (or in transport drop out a few), but they will have to deal with the different factions to acquire some of the weapons as I won't be making them generally available. I also like to make players choose sides sometimes, even the mercenary ones. Sure, they can try to work one side against the other, but I'm going to drop a few tests in their laps and let them deal with the dilemna.
At some point, I'm sure there will be a player that wants to play a Rebel, just like I know we're going to have some (if not all) wanting to play Force users. It might take a bit more work, but having conflicting Obligation, Duty and whatever the mechanic is for Jedi working against each other will have my players talking more and more and getting into character and working things out.
That's why I will own all of the Core Rulebooks. So I can present as much of a living galaxy for my players to interact in as possible.
