Lost revenue from not selling accessories and warranties to people who wouldn't have otherwise bought the original product in the first place? This only makes

Lost revenue from not selling accessories and warranties to people who wouldn't have otherwise bought the original product in the first place? This only makes sense if the base product is a loss-leader, and all of the margins come from the upsells. Best Buy may work this way, but I'm pretty sure Apple makes a profit selling even the barest iPad configuration.