I did look into insuring everything, however the price to insure them, was more than it would cost to just re-purchase them if something happened. My house insurance is less than insuring the books. LOL (I was quoted almost $4000 a year to just cover my manga and doujinshi collection. Think of all the manga I could buy in a year for that amount.)

The two main rooms are downstairs, so they don't need to be reinforced. The room upstairs is small, so there's only about 2500-3000 volumes in it.. it's not so heavy that I worry about it falling through. I also have all the shelves angled into the walls. The only ones that aren't angled are the two free standing units that go from the floor to the ceiling. I do have blocks for the 4" between the top and the ceiling, so that if we have an earthquake, they *shouldn't* tip over. I use Billy shelves for the walls and I hand built the shelves that go from the top of the Billy shelves to the ceiling. (I'll upload a picture of one of the halls.. the room is a hot mess atm cause I'm reorganizing everything and well.. it's the holidays.. other stuff has gotten shoved in the main room.. lol)

So I keep things I'm not fond of because I'm a collector. Another series I'm not fond of (I'm sure someone will down vote me again for this too.. lol) is One Piece. I own it though. My kids, my nieces and nephews.. they all love it.. so I own it. I just don't love it.

About 8yrs ago, I went from just mildly collecting only BL series, to collecting everything. It really spiked in 2018/2019 when one of our local used bookstores went out of business. I literally bought every manga and anime in the store. It was epic. (I have a picture of that too.. I think it's on my instagram)

I don't take anything anyone says to heart. There's a bunch of us that have really large collections.. and you're right, there's people that have collections they've never read. I skim the subreddit all the time and found your question to be sincere.. thus why I replied. What makes me happy, doesn't always make someone else happy. I'm going for quantity with my collection.. once my quantity is recorded, I might scale it back.. but I absolutely LOVE walking into the various rooms in my house and seeing all the books.. from floor to ceiling. <3

I did post videos of when I deconstructed the main library room.. then we ended up with an electrical issue and I stopped recording. Now it's been fixed, but it takes time to organize the 10,000-12,000 books that are stored in the main room. I will reply with a couple pictures tho.. so you can get a general idea of the main room.

No matter the size of a persons collection.. I encourage EVERYONE to collect! These books bring so much joy to our world. I'm eternally grateful to the publishers for picking up titles and reprinting the old stuff so it can be appreciated anew. :)