Yes the ship droids love the cultural artifacts, while there are no grade 6 maintenance gifts it's still a hell of a lot cheaper to use jawa junk for leveling the driods, or Koth if you so choose. My question is what do you have to spend jawa junk on since they don't have grade 10 crafting mats for exchange.
Ok so as of the patch 5.2.2 you can now get grade 10 from jawa vendors. Still if you have extra it's still the beat bang for buck to get a lvl 50 companion.