Never use a bonus bet for an EW investment, reason as follows lets say the nag is placed at $3 and you've had $10 EW using a bonus bet, they will pay you $10, because they will deduct $20 from the return, whereas if you place 2 seperate bets i.e. $10 win and $10 place you will receive $20 payout i.e. $10 bonus win bet lost so thats it, but $10 place bet places and pays $30-$10 (bonus stake) leaving you with $20 in other words they are double dipping the the stake on the win bonus bet, but we're not surprised are we?