Like many others, you assume the sportsbook is in the business of being a market broker, i.e, trying to even out the action and simply collecting the vig. I believe a book's intention is much different. I believe the book is in the business of gambling because that is what sportsbetting is. They know their clientele. They know full well who they can deceive and why they can and when the opportunity presents itself, they know how to take advantage. I've said it before and I'll say it again, this is the world of eleven to ten. It's smoke and mirrors, deception and chicanery at its finest. The whole devilish operation is polished, clear coated and buffed to a sparkling shine. Granted, there's math involved, but it's not what you learned in school. What do you know about Monte Carlo and Las Vegas algorithms? How sharp is your Boolean algebra? "What you see is not what it appears to be." Don't freak, this is just based on thirty some years of observation. Good luck.