That's still reasonable, if that was the plan. I was thinking of using it on some of the many bone chips quests for faction, as doing 8000+ bone chips one at a time would take forever. If you can do 400 chips at once and it take 200, that would be a huge time (and hand cramp) saver. Last time I remember doing one was in FoBone for Cabilis faction, and 2000 chips took over an hour due to having to stop for the one KoS roaming guard.
EDIT: Tested it out: So far, 2K bat wings in S Felwithe got me from dubious to indifferent in a few seconds. 3K bone chips in N. Felwithe got me from scowls to apprehensive. 3K bone chips in Field of Bone did nothing to faction, still indifferent to the quest NPC and scowls to the Crusader (SK). I think that quest is broken, as I've been the same faction levels for over 6K bone chips and should of maxed on some of the other factions, not just the cabilis legion.
NPCs seem to take all 4 stacks if you give all 4 slots full stacks.
Edited, Sep 20th 2012 11:59am by Yther