The problem with sea is that it is so close to good, and it could be good if they put the effort into fixing it. Make the pop items 100% drop, pop the torques up to a 50% drop, throw in an abjuration or two for each Jailer at a 25% drop rate, maybe some other random Rare/EX armor or weapon. Was that so hard? (Obviously.) Look we got some people out of sky to farm sea.
The problem with sky is that it is good, very good. Sky is a victim of its own success. They nerfed Ulli's pop rate to try to get people to sea, it did not work because the Shinra still drop some of the best gear imaginable in the game.
Gil farmers could farm Jailer pop items, hell they could sell Novio/Novia Earrings and AV drops for shit tons of money. They don't because it is just not worth the time. And plenty of gil farmers have access so they can farm Limbus for Ancient Beastcoins.
Instead of sky and sea swimming with gil farmers, I would rather that Square get off of their asses and actually take a role in getting rid of the gil farmers. We all might as well hold our breath for that.