Crafting materials in dungeons and the "need" option

[Andriel]

You need it to craft items to sell them to get gils.

How do you want to know what exactly I do with these crafting materials? Last time I checked, we didn't know each other and I never mentioned that I'm crafting for profit (which I don't).
You assume much for knowing little.

If now Saurian Skin drop in the dungeon and you are not as a Leatherworker in the dungeon, then you should only can roll greed on it.

That is not what I wrote. Read it again, this time with your brain turned on.