Personally I think there is a ton of waste worth extra chargers, cables you might or might not use.
I'm kind of torn on this because I rather like the idea of the OEM tossing in a cable and/or power adapter built to their generally high standards. But then again I've got so many of them and I typically just keep them in the box or just put them aside with other cables. My preference is to use aftermarket cables and power adapters unless nothing else works as well.