Unlike traditional bookies' Starting Price, there is no margin for profit built into the Betfair Starting Price so it often gives you better odds. Commission is the amount you are charged by Betfair on your net winnings on an Exchange market.

For this reason alone, Betfair has no reason to ban or close your account when you should win. This is what Betfair first became famous for; peer-to-peer betting. Whilst the Exchange account won't be closed for winning, there is an additional commission rate.

A bet placed with a Bonus Bet will pay out the winnings minus the Bonus Bet stake. For example, if you placed a $20 Bonus Bet at odds of $10 your winnings would be $180. This is calculated by multiplying the stake by the odds ($20x $10 = $200) and then subtracting the stake of the bet ($200  $20 = $180).