I have been playing for around 6 years and probably use somewhere around only 1/4 to 1/3 of my vault in reality. Weapons that are "god rolled" but with little to no play time are useless to me, so I deleted most of everything that I already had a similar roll of. For example, why would I keep a Patron of Lost Causes with Triple Tap and Kinetic Tremors when I already have a Nameless Midnight with the same exact roll for a difference of only 20 RPM slower and far more play time on? Sure, the model is nice but they fill the same role so they are directly competing with each other for the same slot. It makes sense to keep around one to two rolls of each type of weapon for surges/seasonal mods/PvP, because when push comes to shove I will pick one favorite for that slot and ignore the rest in the vault. Working off that mindset, I have reduced my vault to just under 400 currently, and hoping to work down to 350 ideally before July.