Or for the sake of giving away fewer MacBook Airs? Not that the warranty covers accidents per se, but Apple's advertising the MagSafe's "safety" benefit leaves them at least somewhat exposed to potential liability. The profit on the adapters is going to be offset significantly by the increased inventory required to stock and service twice as many port and PSU configurations and the cost of bundling an adapter with every Apple display sold in the foreseeable future at no extra charge.