Here's someone who actually knows what he's talking about.....
Jay Rood, sports book manager for the 12 MGM Mirage properties:
"In the next few hours," Rood said, "I've got a big decision to make. Right now Pittsburgh is favored by seven; do I drop it to 6 1/2 to lure in more money from Pittsburgh? The way it goes now,
if Arizona wins or covers the seven-point spread, we lose big."
Not only did they lose big on the spread due to the Cards covering, they also lost on the props due to so many favs hitting.
"
Twenty-five percent of all the wagers taken on the Super Bowl are propositions such as who will have more points today,
LeBron James playing against Detroit, or the Steelers?"