good to see someone with common sense here. i have a friend who works at the meatworks, and the reason your $1 burgers are $1 is because mcdonalds gets the offcuts and scrapings cheap, it literally is the shit the scrape up off the floor. not that i would touch it anyway being a vegetarian.
Actually, McD's use their own cows and what they do is process the whole animal, bones, skin and everything except the intestines.