do you use the end pieces?
Exactly. This is an example where the sharp marketing consultant actually earns his bloated salary. Odd numbered loaves of sliced bread was one of the most remarkable and tactical innovations since, well, sliced bread itself.
Any breadwinner knows that when it comes to a pre-sliced packaged loaf, the two crusts bookending the soft and doughy middle are to be avoided at all costs. We initially worm around that meager first slice to get to the good stuff, but that discard piece is left in the bag, and it increasingly ways on our mind as we work our way through the loaf. No, it isn't the ideal slice to use, but the human urge to get the most 'bang for buck' -- some call it maximum capacity, others resource management, still others Judaism -- is often to strong to be resisted each and every time we want to prepare a sandwich. Thus, after many instances of neglect and avoidance, marketing statistics and consumer reports show that that end piece will eventually be used at approximately the halfway mark. The problem with the other bookend, partner in crime to the first, is simple; its chances of consumption are radically reduced by the fact that it isn't encountered until the bag is almost entirely empty. That same immediate repulsion to the first scrap is felt towards the second, but because it is all that remains of the loaf -- just an empty bag with a petty piece lying squished at the bottom -- it is disposed of without a second though.
Now, the major players in sliced sandwich bread (Wonder Bread, Ben's, etc) tried to solve this problem for decades. They went over the alternatives; everything from throwing out the end pieces post-production to the suggestion of two twist tied openings at either end of the bag to encourage multiple fronts of attack. The issue persisted until the best solution was finally found; as if so often the case, that solution involved a sacrifice, in this case of the second have-not. And for all its worthlessness, this was still a heavy price to play. But for the benefits, it proved worthwhile.
I'm sorry this doesn't fit into your sandwich obsessed agenda, but they're the facts and chances are slim that they'll change any time soon.