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Aye I did mean literally.

The confusion arises from “married” not necessarily meaning “married to each other”, in this context, especially since the number of professors is unknown. I did not even think about it as a possibility until I read your comment.

You would probably be surprised at how little money a textbook author makes per copy. Think $2.00 on a $200 book.

It can add up to a significant sum if you're lucky enough to have your textbook adopted by many large universities nationwide, but I'm dubious that anyone is getting rich from a textbook used at only one university, even a large one.