There's not a lot I disagree with here Jack. For the most part, I agree with most of what you say. Your are king dingaling when it comes to stating things in an irrefutable manner.
However, there are other reasons and one is that a man with 100+ dogs, winning dogs, with no internal parasites, external parasites and dogs housed properly and dogs that have been "done right by" in many many ways, may just be feeding PREMIUM Ole Roy (I know - I know - not much difference in this and regular Ole Roy and I agree - BUT it is better than regular) for the cost effectiveness (meaning monetary only) angle possible.

If I wanted to argue against your "ignorance" stance, I would argue, that a man, breeding, handling and selling winning dogs, is not at all ignorant to be saving in feed increasing his profit margin. Actually sounds smart to me.
If I were to argue against "laziness", I would say a man whose yard is immaculate, FULL OF WINNING DOGS that have won ALL OVER THE PLANET, and every single animal on the yard looks like a thoroughbred, would contradict him being lazy in any way at all, except in the area of feed. A yard with 40+ animals, all in perfect condition, with numerous winners and champions, zero fleas or worms contradicts a lazy dogman.

Simply b/c a man is perceived to be lazy in your eyes b/c of what he feeds does not constitute the man lazy. One aspect of many aspects (the dogs are only one aspect of most folk's lives) of one man's life does not constitute a lazy man. If that logic holds true then every man on the planet is one lazy SOB!

Lots of factors to consider.

Where you a lazy dogman when you were feeding Canidae?