Well there goes all that effort trying to split $0.50 wide spreads in the SPX... damn pennies 


Quote from Option Trader:
IB may make a fortune on cancellation charges.
Quote from Option Trader:
With $.05 to $.10 gaps, then you'd want to cancel your option orders only after a larger move in the stock price. With penny increments, you may be jumping back and forth every minute. Traders looking for middle prices would not want to use exchanges or brokers that charge for cancellations.