Were your parents too poor to afford books? That's kind of the point of the post you're replying to. If your parents could buy you all the books you wanted to read, then you were lucky.
See, my parents were too poor to buy books, especially as much as I read when I was young. My parents were more worried about keeping our home repaired and food on the table than buying me all the science fiction books I wanted to read. So, they took me to the library and I got to read A LOT.
I was additionally blessed in that the local library didn't just carry books, but also had computers. I had a keen interest in computers from playing with them when visiting friends and relatives, and the local library could loan out Commodore 64 computers for a while. My parents got the computer for me several times. It was a great way for me to learn about programming without them having to spend money buying the computer. Yeah, sure, I spent most of my time coding up games (no surprise I'm a game developer today), but it gave me a deep appreciation and love for computer programing that informed my education and career choices.
I went to college and got a B.S. in Computer Science, a B.A. in Spanish, and a minor in Business all in 5 years if we want to compare degrees. I might have still gone into CS without getting the computer from the library, but I believe it gave me a huge advantage in figuring out how much I enjoyed technology that playing computers at friends and relatives houses didn't allow me.
So, even if it doesn't benefit you, don't think its useless to everyone. To others, it can be a life-changing experience. It was to me, and it probably would be to some kid today who grows up in a family that can't afford a computer and internet connection.