Weapons wear out. I guess you might need to farm (for 30 seconds) some sticks very early on just in case.

But now I have 4 or 5 more weapon slots than I started with and 3 additional ones elsewhere. And they are all full of different weapons. Now the hard part is figuring out which ones to keep when I come across new weapons, so I'm usually happy when something breaks because it takes the decision away :p