I'm with
@SkullTraill on this.
You see, the isue with piracy is that it is not an issue, but symptom of an issue. Consider this: Piracy of computer games almost disapeared when Steam was lauched. Why? Because before that people needed to make copies and hacked games even performed better than official ones. (Assassinc creed 2 demanded login to web that unironicaly collapsed so official games didn't wrok while pirated ones did) Also moving game from PC to CP was a problem. CD/DVD got scratched, etc. This is not problem of people not wanting to pay, it's problem with miserable quality of service.
Or Netflix, that for a short time killed piracy of movies and series, putting them all on one place for low fee, untilll it broke with all those companies offering only their series... causing this kind of piracy to flourish again.
Now to us... We have a service problem too. You buy a book, especially occult and have no idea if it is what you want or even if you want that one. Descryptions are misleading, sellers do not know what they are selling. Not to mention Amazon with its policy of selling licences instead of books, making it same way as Steam while books are not the same as games. No. We need completely new approach at large.
But at personal level of single writer, your weapon of choice is not justice, but advertisement. Doreen Virtue or Silver Raven Wolf sold shit, yet they made a fortune, because they got community, they created the demand for selling their books. Without that you have to provide what people desire. Which of course is not quality, people want to read what they want to hear. Quality occult literature however sells too. Ixaxaar bets on quality of both content and print, selling print after print of their books.
So, if you are not selling, you are the one doing something wrong. Piracy is barely telling you that your book is out, being an advertismenet on itself. If it is good, some will go and look if they want to buy the paper. Price of books is also crazy, honestly. In Europe the books are cheaper than in USA too. ( even50% less)
But people will buy if they are convinced that it is what they want. Why do you think that advertisement is evolving now so hard? Big companies now hire psychologists to make their advertisement more efective, alṕps more adictive, so they can earn more money.
And you can do soemthing too to raise your sellings. It's in your hands. Keep in mind, that piracy indeed doesn't matter. Some movie companies now watch for how their movies are pirated as yet another variable showing how they are popular, because that peans that people are interested in them and even if they pirate one piece, they are more likely to buy next one...