Betfair is a true innovator in the sports gaming space and not only brought the concept of a sports exchange to the masses, but brought sports investing as a safe investment concept to millions of individuals around the world. In many ways, their exchange legitimized sports wagering as a professional endeavour.
Betfair charges Commission only on your net winnings on a market. You do not pay commission on losing bets. How much Commision do I pay? This is how it is calculated: Commission = Net Winnings x Market Base Rate x (100%-Discount Rate).