Is there some place to look how do this in game?? I just sold someone 70 fire crystals for 1000 gil instead of a choice of how many fire crystals to let go or a choice to proceed it just took them. I thought he was buying them a 1000 each any had 70 in his inventory. I'm thinking this game has a seller beware and learn from your mistakes attitude.The red word selling means the person is buying in this game,and it cost me 1/3 of my crystals to learn that.
The red word is actually "SEEKING". When they are selling it will just display the price that they are selling the item for.
Additionally at times you may see the word "DAMAGED". This is someone that is seeking repairs. The reward will be listed in the entry. I don't find repairing peoples items to be profitable. Especially when they expect you use your own mats and they only offer about 200gil.