I understand where you are coming from, however I think you are slightly overreacting because you are unaware of how the event works. It doesn't really matter if you farm way more than someone else. It doesn't work that way, that each mob you kill has some chance to drop the fragments. There is a set amount of crystal fragments that can drop in a set time-frame for the entire server. e.g: 5 fragments per minute for the entire server. That means it is pure luck when you are trying to drop it from normal mobs.
Bosses are another story, they drop the fragments always, however to be really able to exchange the fragments for crystals, some time will have to pass so that enough fragments accumulate in the server that you are even able to exchange them.
It was designed so, that from some point there will be a slow, but steady growth of available crystals in the game, but this can take weeks from the event launch.

Nevertheless if you feel the same way after this explanation we can consider your suggestion to connect it with HB level.