I was thinking about this the other day, since a LOT of people use free sites instead of buying subscriptions or physical copies nowadays. I was just curious about what physical manga other people own, or what they'd be willing to buy to own since it can be a pretty pricey hobby. I had a bigger collection when I was younger, but now I'm an adult with bills and limited space, so I only have 2 shorter series or so on my shelf lmao.
I also just started working at a bookstore, and I'm the only employee that's interested in manga, so I thought it might help for me to read manga series that people are more willing to spend money on so I can make better recs for customers coming in!
Here's the Manga I own physically
Blame
Pluto
The Girl From the Other Side Siil a Rn
Uzumaki Spiral into Horror
At the Mountains of Madness
Battle Angel Alita
BioMega
Black Torch
Death Note
Frankenstein
Fullmetal Alchemist
Hells Paradise Jigokuraku
Planetes
Sneeze Naoki Urasawa Story Collection
SPY x FAMILY
Tropic of the Sea
All You Need Is Kill
Darker than Black
HP Lovecrafts The Hound and Other Stories
IchiF A Workers Graphic Memoir of the Fukushima Nuclear Power Plant
No Guns Life
Venus in the Blind Spot
Blame Movie Edition The Electrofishers Escape
The Drifting Classroom
Abara
Higan Itan
JoJos Bizarre Adventure Part 4 Diamond is Unbreakable
Master Keaton
The Kingdom of the Gods
Tokyo Ghoul
Vinland Saga
I own about 150 volumes of various manga and LN. Ideally I would have a physical copy of everything I read, but that isn't particularly realistic, so I buy volumes of my favorites.
Some of my volumes are in japanese (which I don't understand) because I wanted to support the author.
Here's a pic of just my Konosuba books

I usually only buy the series I “really liked” and I also only buy them in the original Japanese format since they either don’t have a English release or it not fully released or it looks terrible.
I would just recommend people to start with what you like and work up from there, better buying something you will enjoy to have them not.
Im going to buy
Arifureta Shokugyou de Sekai Saikyou
someday.
i have various volumes of different ones, but im mainly collecting dr stone (currently vol 1-11, hoping to get the rest of the currently released soon) and the bungo stray dogs light novels (vol 1-4, which is all that's currently released physically in english), but in the future id like to collect all the bungo stray dogs and shingeki no kyojin manga ^^
The two complete series I have are A Silent Voice and The Ancient Magus bride.
I have stand alones like Opus, God's Wish and a lot of Junji Ito titles, Uzumaki, Gyo, Tomie, No Longer Human, Frankenstein and Dissolving Classroom.
Unfinished series are Beastars, Happy Sugar Life, Magi and Komi San
I mostly buy whatever manga is at my local bookstore. I really hope to have the complete series of Magi one day as it's my favourite manga. And one manga I might just have to buy online since it isn't in my bookstore is Vinland Saga. I'm up to date with it and it's so good! I need the physical to support the author.
The newest additions to my collection is Happy Sugar Life volumes 4 and 5
This + some extra I bought since I last took the picture, am willing to buy a lot of manga lol:
Wtf, you've got a ENTIRE room for your stuff???????? I didn't know you were legaly allowed to be this much a baller.
You should add some deco in there though, it looks like a basement
i wish, i've just been so lucky that I got to get a big room recently, and I don't have a lot in that corner yet
I do have stuff, this is just before I put it there. I took this picture right after I assembled the shelves and put the manga on the shelves.
I got a really nice armchair, an (improvised) little table and a little carpet in front, and I'm planning to get a nice lamp and pouf as well, to make it a nice reading corner
light novels, cos i cant use a phone at school, and reading manga would make me look weird. the ultimate way to fuel my addiction to consuming japanese and increasing my numbers on this website.
Monogatari Series First Season
Monogatari Series Second Season
Rascal Does Not Dream of Bunny Girl Senpai
86EIGHTYSIX
BottomTier Character Tomozaki