Why everyone farming teeth?

[Rare]

Actually if you don't have a arcane shard right now there is no use of farming teeth cause:
1. the weapon you can buy with them sucks.
2. You can't trade the recipe.

Except sts makes the recipe tradable or the shard weapon competitive farming teeth is just a waste of pots and time.

Yes, but why would you wait until you have a shard to start hunting teeth?