There are three tiers of weapons people use: legendary, mythic, and doomed.
There are three tiers of weapons people don’t use: common, rare, and epic.
The only good use for epic ingots is for kingdom requirements of upgrading weapons. That’s it. No one is actually playing with them for any reasonable amount of time. In other words: people in guilds that can actually complete Epic Brown tasks probably don’t have players that still need epic ingots.
It is trivially easy to get legendary ingots from PvP and delves as well, and legendary weapons are handed out like candy.