I received an email from Amazon yesterday stating that their printing costs were increasing on June 20, 2023. I used to sell my book at $49.95 per copy. At that cost, I made around $4.73 per copy in the U.S.
However, after June 20th, I would have made $0.17 per copy. I increased the cost to $58.65 per copy. Right now, U.S. sales net me a $9.35 royalty. After June 20th, I will make $5.63 per book. I hate increasing the book cost.