"I ordered some Rust books from Amazon (printed in house) and they basically seem to be ebooks that have been printed out, loads of whitespace in random areas and no signs of proof-reading.

Yeah, there were multiple books that I read the reviews on amazon and people were complaining about the poor print quality. One of the Ted Greene books I got had a typo on the 2nd page in the table of contents, so I'm not sure if any proof reading is being done really.