A few years ago, when we decided to have our flat redecorated, we had to remove all books from three bookcases (which are so high that they are fastened by screws to the walls because otherwise they would be unstable) and all the others strewn around the place. As a result, we had 40 boxes and rubbish bags (the ones from strong plastic are very good) full of books and comics. That was the point when we bought an ebook reader - but we still buy comics and my husband buys or gets professional books that are not available as ebooks. As a result, we recently cleared up an upper shelf in the wardrobe - in-built and very deep (my wedding dress had to go somewhere else) to put some of the comics.
And these are just books that we wanted to keep, one with autographs or simply ones we like too much - every two or three years we look through our bookshelves and take everything that we do not want to keep to the local library.
