Don't remember where I saw this but: "The act of purchasing physical books and the act of reading them are two entirely different hobbies and practices".
Additionally, if someone downloads your book for free, and barely reads it, as you suggest, have they _really_ done much more than picking up the book in person, scanning the table of contents, reading some pages in particular, then setting the book back down? What you're describing sounds like the digital version of what I used to do at physical bookstores; it seems a less compelling argument against what the z-lib founders were doing, not more.
Additionally, if someone downloads your book for free, and barely reads it, as you suggest, have they _really_ done much more than picking up the book in person, scanning the table of contents, reading some pages in particular, then setting the book back down? What you're describing sounds like the digital version of what I used to do at physical bookstores; it seems a less compelling argument against what the z-lib founders were doing, not more.