I currently have 14 jobs myself, and my mog safe is always at 80/80, my locker varies from ~60-80/80 depending on job I'm playing (my SCH and BLU take a LOT of gear so I see my inventory quite full), and my storage is about at 75/80 or higher unless I'm pulling one of my jobs out of there, which conversely puts my locker at 80/80 often enough. My Mog Sack? Rarely goes below 70, because I put all of my situational items there from NIN tools (including some toolbags for more-used tools!), ammo for COR, proc weapons, trial weapons, pop items, PDT/MDT sets (so I don't forget them), pet food/jugs for BST, etc. Honestly, I want to level a few other jobs (I was considering PLD for a while) but I can't because of my current inventory issues. I can't even cap effectiveness on some of my jobs because I just don't have space.

So I'm all behind adding to storage space; it'll allow me to 1) optimize the jobs I have now, and 2) allow me to level more jobs rather than being stuck at a cap or else risk losing effectiveness if I want to play others. I second (or whatever number this is by now) this motion.