See? So there you go. Certain characters have common knowledge of them based off their behavior akin to zombies in movies or games, but from reading Kurisa's post, it seems as though he doesnt, seeing as he wen't for the heart immediately and not the head like people who know about zombies would naturally go for. 

And I think the reason people who have weapons haven't been keeping track of the usages thing and what not is because its an odd concept not typically used in a roleplay, and some may feel it may limit how they wanna expand on their posts. It's different, so it'll definitely take some getting used to. But, my guess, is that it only applies to...environmental objects that have been picked up. I think logically, characters who may have a personal item like Kurogane's bokken, especially depending on the quality of it, probably wouldn't break easily and knowing how rich kurogane is, his is probably VERY high quality. 

But then...what about other sturdy environmental objects? Sure...you pick up a wooden chair, u probably only get one usage. But what if someone picks up a metal rod? Its steel metal, so its not like it'd just break after a few uses. Unless u impaled it in the zombies head and left it there, thats my only guess if it "running out" its uses. I don't know...just my thoughts I guess.