I will ask a lawyer about this just to make sure that I am doing everything properly.

I understand that a CC licence should only apply to the underlying map data if the map has been edited to be unique to the publication, in which case the rest of the publication can be copyright. However just exporting a PDF and including this in the book in the original OSM styling may be a different situation.

I would assume that OSM ideal of truly free maps would encourage commercial use as long as those that use the maps give back to the OSM project either by contributing to the mapping effort or by sponsoring OSM events.