You have a $1000 Bonus Play and a $1000 Account Balance...
Your first wager is a $300 and it losses, would you rather it be a loss on with Bonus Play Money, or your Account Balance.... Or does not matter at all...
You get points/credit from most books when you gamble real money (Bonus Play does not). But agree with TopShelf, you lose $300 either way. I'd rather win