Your point being? The author was paid for the work. The the publisher makes or does not make a fortune should concern the author in what way? The publisher took the risk, the publisher reaps such rewards as he can.
Again, the point is...? Did you pay money for the book? If so then it's your book. Do with it as you may. If I were the author, I got paid to write it, I can claim no harm. If I were the publisher, I sold it, I can claim no harm. If I wanted to preclude anyone from copying it it would have been incumbent upon me to find some way to make it that way. Impossible you say? So what I say. If the publisher is troubled by this then he didn't charge enough for it.
About 40 years ago I built a car, I started with a 1959 Austin Healey into which I installed an ~500hp. V8 with an aftermarket automatic transmission and a narrowed aftermarket rear end, new suspension, smartly flared fenders, new everything, and an eye popping candy apple paint job. I sold it for $5K. The guy that bought it tooled around in it for a few months, entered it in the Oakland Roadster show, and then sold it, completely unchanged from when he bought it, for $10K. Should I feel entitled to any of that extra money? I didn't and I don't. I got what I wanted for it. What he did with it was no concern of mine. Moreover, are Mssrs Austin and/or Healy entitled to any of the money I made off of it? What if it had been, say, a book instead of a car. What difference?
Sometimes I do wish I still had it, that sucker could give you a nosebleed.