who said it should drop a necklace every kill? Low drop rates are worse for non dominant clans. if all drops only have one tier, eventually all players will have the same gear as the rest and be able to compete. that's how it is in other MMOs.
Pretty much every mmo that does not have instanced dungeons for raids winds up like ch. Progression is exponential - first you get a bit ahead win a few more locks and get better gear. Then you win locks more often with the better gear and pull farther ahead. Eventually you are winning near all of the locks and locking everyone else out as the power difference is quite large.
In any case having an extremely low drop rate and leaving it to luck alone is screwing up whole worlds. It should probably be pseudo random (could even keep the same expected numbers of drops) so that a minimum number of items would drop guaranteed. I'm pretty confident some of the godly charms from this years summer event didn't drop on *any* world which makes no sense at all.