If you don't read a book multiple times, why not borrow from a public library (if such a thing exist in the country you live in)? Here in Sweden they are free, and you can even get them to loan a book from another library if they don't have it locally (though for physical books it will of course take a few days to get it delivered). Remote loans used to cist around 20 SEK (about 2 EUR), but is now also free since earlier this year.
There are some books I absolutely buy (and I have a rather large library myself, entirely physical), but there are many cases where borrowing makes more sense.
I prefer the slim device that keeps track of where I am in the book, has a built in backlight that is easy on the eyes and doesn't disturb my wife when I'm reading in bed until long after she's asleep, and that lets me acquire the next book in a series with only a little bit more effort than it is too turn the page, over the heavy physical tome that would tire my arms.
I am a creature of comfort after all!