Damn, I am poor so I am not even at the point where I can even dream of collecting things. But that reminds me of something I think you would find interesting.
Actually now that I think about it. I am not sure if you would find it amazing or horrible.
I wish to be a novelist. And for fun, I once wrote sort of dairy entries to get inside my characters head.
If my story was successful. And this girl was a popular character. I thought it would be really cool to design the full dairy. Like, design damage to it, from age, coffee spills water ext. Write every entry and even intentionally put grammar and spelling errors. Then get a girl to hand write it for that authetisity and pay a guy to intentially damage it.
100% authetistiy to the version in the story. To the point I would only make one and wouldn't even release the material in the dairy. Then, auction it off for charity.
Figured 1 makes it an ultimate collector item but at the same time not sure if that ruins the appeal because it would be too rare to be enjoyed by the masses. I am conflicted here.