ItsCold:
you probably ran 2 coaxes because you could, so this solution didn't have to occur to you; or because you are a closet genius and you will need to add other signals to those cables in six months, when the new technology makes your present setup obsolete; or maybe you just did not want to stress the electrons in a single cable.

Plus (are you an installer?) installers, or people who think like them, tend to drag all the possible wires they can all at once rather than have to come back later. That sounds like an installer ploy. I have been so convinced that I should do that that I have secretly run additional wires, at no charge, with the required ones, then charged almost an arm and a leg for them when I came back to do an upgrade and I did not have to drill, crawl, feed and yank.