5-10 minutes isn't what they're betting on. They're betting on matches. You predict outcome of the match based on current information. If you have more of the m

5-10 minutes isn't what they're betting on. They're betting on matches. You predict outcome of the match based on current information. If you have more of the match behind you, you can make more accurate bets, even if the outcome is still an hour away. The information asymmetry means you can find winning bets even if the market is otherwise efficient.