The TC's request is simple. If you capped lore, you get poetics instead in dungeons. He's not requesting a trade mechanism to exchange your lore to poes from a NPC.

A similar concept is already in place with beast tribes. If you're lvl 60, instead of gaining exp (which you're already capped), they give you 5 lore instead.

I don't see why people are against this. This will give people more reason to do things once they're capped with the weekly tomes. Just like the TC, once I capped my weekly tomes, I lose interest in doing roulettes.