>Due to that, I won’t be buying your book.

I'm on the same boat as you. I might still buy this book, it seems beautiful.

In the days of online autodidactic zeitgeists, it's a shame not to include the solutions. I understand the author wants to monetize his hard work and ensure it'll make money as a textbook and I believe textbooks can provide some income as long as they become the mainstay of a particular subjects.

That being said, I wonder if there is a future option for creating a problem/solution booklet exclusive for the teachers and opening up the solutions to this book so the entire world could possibly learn from this book.