Even back in the day, people who really read rarely owned large libraries. Instead, they owned a library subscription. For instance, I’m a very casual reader with at best, maybe 4-5 books a year off the curriculum. That means I actually prefer buying the books since I’m not in the habit of going to the library. My professor on the other hand, reads a book or two a week. He only owns stuff from the curriculum and borrows the rest off the public library. Finally, penthouse neighbor has over 200 books in his library. He hasn’t read a book in 20 years since collage.