We all know that these exist, and that 90% of the time they work, and well, even if the return is usually only 2-4%. But my question is concerning betting exchanges. No matter what the result of a sporting event, they make money. So this is my question:
Why do they not purposefully creating arbitrages?
I mean, if you bet on something at
ladbrokes, then lay at
betfair, then
betfair earn money no matter the outcome. You win at
ladbrokes, so you lose money at
betfair, which means someone else wins, which means that make money off their commission. But if you win at
betfair they make money from you. So why do they not create them?
Is there a governing body that states they cannot do this?