Animal welfare aside, I find people in North America really in favour of chicken breast, much more than other parts, say chicken thigh. Yet I myself think chicken thigh tastes much better, especially with the skin (yet again it is usually skinless in supermarkets here, unfortunately). Is it because of nutrition (percentage of fat/protein etc.)? On top of that, chicken feet are considered unacceptable by many...
I also wonder if chicken breast consumption has been promoted by the poultry industry because it's easier to increase the size of breasts through breeding and injecting solution than it is other parts of the bird. That means they can produce more pounds of breast (at a higher price) for sale per bird than thighs, wings, or drumsticks.