Some chicken is like that, you shouldn't have that much yellow, mostly where I see it when I buy chicken is at the ends of the drumsticks.
The yellow skin results from high levels of carotene in the diet. This is usually from corn.
Carotene is an orange pigment which is used by many animals to synthesize Vitamin A. It is stored in the fat so that is why if you see it in the fat or skin.
Some people will pay extra for 'corn fed' chicken because they think it is a superior product.