I like grinding, but I dislike wasting time for nothing.
This game has a lot of stupid and sometimes incomprehensible decisions behind its systems, but ok, the idea is to keep you playing, but each grind, each little thing, every goal I ever wanted to achieve, I completed it, except *Eidolon arcanes*.
A lot of people say: "Railjack sucks, Rivens shouldn't exist, profit taker is too difficult", but no one, well, almost no one talks about how atrocious, boring and inherently bad designed Eidolons are, oh yeah... and time gated, and please, let's not talk about Orphix Venom, I'm not farming those arcanes with worse drop rates.
So there are only a couple of reasons why Quill Onkko do not sell this set of arcanes (like ALMOST every other arcane in the game) for Radiant Eidolon shards or any other sentient related currency:
1- Mystification around these Arcanes inflates the prices, contributing to platinum sales.
2- DE likes to do a little trolling.
Bye :v/