I agree that 30 eidolon bones and about probably 500 void essences is out-dated for the stuff they offer. They need to add more stuff to their vendoring system for all that to be worth it; but it is a grind.
For the quills, pretty much everything in there is outdated. I don't understand why they still have not added anything of worth in his shop for that many eidolon bones. Yes, they are bones.
For Necroloid, it can be easily obtainable, since you cand do those bounties and get more than one of those things requirements. For void essences, can be a pain, since you only get about 36 per mission, depending on the mission type and ranking. I have gotten 13 void essences for a 55 level destroy mission, pretty pathetic for a high ranking mission.