Totally agree with this suggestion but there are a few things that we need to keep in mind which are
For instance
-Reasonable amount of ammo for Rocket launchers.
-Chances of obtaining those "Rare" items should be planned deliberately.
(flashback to 1.15 update, horse bets players having 60m in their pockets)
-A distinctive/unique way for obtaining those "Rare" items other than fishing, there was an idea that I had in mind which was:
Air Drops that come randomly timed, containing those "Rare" items as we speak as well as other supplies such as Cash, Medkit, Ammo, and Weapons, similar to
The battle royal games, This can be a new server feature, that would also engage civ vs civ combat (need to be planned deliberately)