I'm a mid-list author formally published by one of the world's largest publishing houses. Deliberately seeding pirate sites with my novel would place me in breach of contract. It's an interesting idea if I were entirely self-published, but not realistic for me.
What if you start a whole new story, which is similar to whatever you have published, and after a few pages just tell the reader, "actually, you're not reading "The Adventures of Foobar"...
The economics of mid-list writing don't really make this feasible ... very few writers get to do more than buy coffee off their work. Creating a whole dummy book just to mess with pirates isn't worth it. Not when I'm going to spend a year writing a new novel in the first place. Then, once that's done, I've somehow got to get back into industry so I can earn a living and recover the money lost while writing ... this isn't something you do because you expect to earn anything from it. Making a few dozen extra sales from pirates?
