I'm not quite sure, either. A part of it, I think, is purifying cursed weapons and armor; much like in the Everfall, once you acquire the gear then it goes on sale. Then again, that doesn't hold true for all of the gear, nor does it apply for all of his items, as the Nomad's Cloak appeared for me once I found him the third time just outside the first shortcut.
"Even a stray has pride." -Gabranth, Final Fantasy XII PSN: Mysteltain
My friend (who can buy DA weapons from him) confirmed the following:
-He has killed Daimon twice, bit so have several others that don't have access to the DA weapons -Affinity for Barroch is not maxed -He has only completed 2 notice board quests -He can buy weapons that he hasn't yet found in chests
So, I'm back to square one. No one has figured this out yet? :(
hi. i'm actually said friend lol. i could buy these from after defeating Daimon for the first time. all i did was buy all the stuff from him that i didnt have already and i also spoke to him every time i met him in the levels. then when i spoke to him after beating daimon on my first run i could buy some new weapons.
the weapons i can buy are cursed bite 2.15mil shooting star 2.35mil graansys flamberge 2.65mil twinpaler 2.75mil helmbarte daggers 1.95mil chilling focus 2.22mil bane archistaff 2.33mil
so far im the only person in my group of friends playing that can buy these. so i cant even think of what it was but maybe speaking to him in every instance could have unlocked them?
also i only have the daggers from the list but i purchased those. havent unlocked any from the list through purification.