ok i can compare it with items from runescape then, alot of the items there that are pretty rare are around 1% drop chance, if you die with it it drops so whoever passes over can loot it, and it despawns in a few minutes, you even have drops thats on the 0.00 scale which you lose upon death. The other day i took a quick look at Anolytics video of the chest he opened, 20 chests or something in and he has pretty much any upgrade, some of the rarest books (AoSH mats) and other upgrades worth millions. I would pretty much say if you want to shift in one week of playing naval action you should be able to acquire any item in the game without sweat