Large collective on the Favorite. A "safe" side. A minority, maybe marginally wiser group, on the underdog because long term it will outperform the Favorite. Still they both fall victim to the Vig. A very few, and frankly elite, pump the passions of both to create swings, also known as volatility, so they can middle the dedicated, emotional, sheep of both camps. Licking in a profit.
Beat the number!