Been playing this game since 2.0. I have 6 jobs past 50 and 4 of them at 60.

I have every raid and tome set excluding FCOB and Alex Savage for Dragoon.

Five sets of tank gear. Four sets of Ranged gear and two for Ninja.

I have sands and oils o time. Crafting mats. Food. Potions and random crap.

My inventory is only half full and I still have 1 empty retainer and 1/4 of a retainer inventory bailable. I don't see this as being a big problem for a lot of the community considering most throw away a lot of stuff.