Very happy to see this published. I bought the book on Wolfenstein 3D and read every single word of it even though I don't much care for Wolf3D - the book is in

Very happy to see this published. I bought the book on Wolfenstein 3D and read every single word of it even though I don't much care for Wolf3D - the book is inherently interesting. I immediately ordered the physical version. It's a pity that the profit is so incredibly low. I'd consider just selling it for $69 or $99 or whatever. I'm not sure it would make such a difference in term of sales - the people who can read this book are in a very nice industry after all. The PDF can be sold at a much higher margin for accessibility for those who really can't pay for the physical book.