Its simple Cueball, these are the main ingredent for hi-poitions which is a great way to finish off alchemy as a sub-craft.
Its called helping others out. Not everything in this game has to be about blindstaking profit and greed. Bad enough RL is like that...
Whether you're putting them on the AH to make a profit or just to help crafters out, it doesn't make any sense to post for less than 300g. If you post at 200 or less, not only will AH fees eat all your profits, but people will buy them to NPC before the crafters can get to them because it's free money.
These NPC for around 241 gil with maximum Jeuno fame. At the moment they are selling for 100-200 gil on Hades, just NPC them or buy from AH and NPC them for a bit of profit! :)