Because people never seem to unwind the whole reel like they should if you don't you stand a good chance of melting the cable together that is let and cause a short. I've seen it done at work and even found out the cable had melted when some one retrned one and I tried to pull it out to use.. At least if it is loose there is little chance of the thing melting together on a coilAny particular reason that these cables don't come on a reel?