Is there really any way to make PA's approach work? From other threads, I get the impression even the people who do a lot of marketing and get books sold don't get anything back. The books don't ship on time, PA claims no sales on a royalty statement, etc.
Assuming everything works as it should, the author would have to market to an audience that doesn't mind the price. Technical non-fic often sells for well over $100 per copy new (look for books in the American Chemical Society Symposium Series), although in my experience most of these books are purchased by libraries or on expense accounts, and PA non-fiction is not likely to be of a technical nature. These books aren't high-volume movers, either, so getting rich would have to not be the motive of the author (or editor if it's like the ACS books). But, in theory, it could be done. I'm sure PA would print such a book if presented with one.