I would also like to point out the fact that there are SEVERAL “sqaure” books that do NOT abide by the simple rules of betmaking, ones that have marketing specifically tailored to bring in “square” bettors. These books oftentimes WILL take opinions on lines.
Now, the top tier books: Pinnacle, olympic, cris, etc. No doubt, they all operate on volume (and even action) and almost ALWAYS will make money, regardless of an outcome. But you have to be open to the possibility that the book that you are promoting as an affiliate may not be one of these books and may have a different business model.