WHY Pet Food Companies, why?

Speaking for myself, I spend a stupid amount of money on my pets. I'm not even over the top, I think. My dog doesn't wear clothes. He wears his nails out walking and doesn't need many clips. I only take him for professional bathes every couple of month. Usually its in the tub or in the driveway. I had my turtle, Clyde, in some body's old pool for 5 years now. I can be a sucker though. I will by Clyde any new aquatic turtle food that comes out. His very existence guilt's me and I love to see him smile. He never likes anything new though. Admiral the Foxhound only gets a holistic dog food. There are only two flavors and two brands he can have. I know I am mild compared to other people, so that means that people in general, are willing to spend a lot.
That being said, why do the pet food company have to mess with the ingredients so badly? I will go to the store and get the boys some fresh fish or red meat. It is my belief that the reason we don't just feed scraps is because these "companies" are supposed to be helping us deliver the best nutrients and vitamins to our beloved pets. I thought they had "specially formulated diets" designed with the animals best interest at heart. Why don't they just make good quality product and charge us the deserved cost? Why do they have to pump the stuff full of fillers and dyes and meats that aren't in the description? There is supposed to be some level of convenience in these products that make them beneficial to us. Is disheartening to see all these "natural" and "health" brands go down too. Even when your paying for quality and even when promises have been made there is no guarantee that you getting a decent product.