This is utter BS. For whatever reason you decide to actually count the books you read … it supposedly requires of you to have finished those books. You can’t have it both ways, you either stop counting, or you don’t count the ones you haven’t finished. You’re only cheating yourself.
Oh, and an active decision to never finish a book is a lot worse than putting it on a back burner for a time, while you read something else.
You know how when you’re wearing shades … you can see well enough … but then you take them off and you realize there’s a lot more colors and hues than you could see with the shades on? That’s how knowing more words is: you don’t know how helpful it it and how much it expands your way of thinking (not only of expressing yourself) until you know a lot more words.
Even the most common concepts or emotions… it’s amazing when you realize how one word can make a lot of difference compared to another.
Just think it’s like having a full panoply of tools for your project, and they’ll award you infinitely more precision while you work than just having a standard set of 6 screwdrivers.