This is because the books already knew this. I see sports investing to be very similar to stock / options investing.
In stocks, there is something called insider trading, which means people make trades based on privileged information that the public does not know. However, because equities are regulated by the SEC this is illegal, but I'm pretty sure it still happens. Anyways, before I get too far off track, the point is that the books have access to said privileged information.
In stocks, there is something called insider trading, which means people make trades based on privileged information that the public does not know. However, because equities are regulated by the SEC this is illegal, but I'm pretty sure it still happens. Anyways, before I get too far off track, the point is that the books have access to said privileged information.