Why do all U/U items sell for 1 gil?

[Mychael]

I imagine the design decision for this was so you didnt accidentally sell it. It is similar to alot of single playing RPG's rare items either can't be sold or sell for a gil/gold piece etc.

....that's not the issue at all. These items can be sold. And if you accidentally do it, you gain 1 gil.

i wish you could trade them into GC for supply mission quest.

That would definitely be a way to get people to run dungeons again. <_<;