Physical copies don't occupy bandwith; for instance, if I was to buy and download 3 games (which I would say I usually buy a month), I'd have taken up at least 80% of my bandwidth for that month, and I'm on the top BT package for places with no fibre optic broadband (<3 living on 3 hills and no where near a main town). 80% of my bandwidth gone equates to no image heavy sites, YouTube videos in anything but the lowest quality, or even for downloading various other tidbits. No frigging thank you.
And physical boxes just feel... right. You have the disc, and nobody else can feesibly take it from you without physically doing so. It isn't dependent on your computer, it's dependent on the disc itself; which is reliable in it's own right. I've grown up having discs; and I'm certainly not getting rid of them, unless any games I do download can be put on a disc. Pedantacism. <3