Do you have a standard of living you want to upkeep without having to work around your pile of stuff?
Do you consider some items not of good enough quality to be owned and maintained by you?
Do you not want to see the world burn and the source of your collection to fail so you can’t collect anymore?
Congrats you have standards and can collect away.
Standard to keep your mound of books small so it doesnt interfere with your life or home.
The second option is just a really bad hoarding hoard with cats.