After watching this, I don't feel *QUITE* so stupid.
Turns out I'm not the ONLY one baffled:
(Start watching this, if you want to, at the 10:10 mark. And NO, I'm not a 20 year old who pictures some fat dude with a black visor, chewing on a short stogie being the bookie. I KNOW the line-setters are sophisticated. It's the line versus the previous result that I don't get. And I'm NOT ALONE. This makes some of the points made by southerndawg about that sophistication, but I'm not the only one in the dark on what is going on.)