It’s really simple: For a bookie, if a customer is winning money, then you are losing money. Doesn’t matter if they are helping balance your books or not. So wh

It’s really simple: For a bookie, if a customer is winning money, then you are losing money. Doesn’t matter if they are helping balance your books or not. So why take their bets? Likewise, bookmakers will happily take bets from guessers all day long. If they are lucky enough to get a ‘whale’ placing huge (but dumb) bets, they can easily lay off those bets elsewhere to manage their risk. They don’t need skilful gamblers to help balance their books.