Gear questions

[Estellios]

I don't believe it's on actions, you lose durability whenever you gain XP (this includes being capped at level 50, you still gain XP it just doesn't get shown since you are capped).

It's important to remember this if you decide to run dungeons like Castrum Meridanum where you might have to defeat a lot of enemies.

[Niwashi]

With normal actions, you only lose durability on equipped items. When you die, you lose some durability even on items carried in your armour chest or inventory.

[Aelis]

it lose 2% each time you die in game, and decreases base on amount of exp you get

[Naberrie]

I still don't think I would. Faster just to drop it. I could go outside and kill ladybugs and get gil faster than selling old gear at an NPC.