I reckon becuase many dairy product also have high fat content and people are phobic about fat in their diets.
All current research however is pointing to enhanced weight loss with increased in-take of dairy products, so the latest decision is that the trade off of some fat with your cheese or glass of milk or yoghurt is worth it.
Women, starved of calcium, are currently reccommended to consume three servings of dairy per day and I am downing a yoghurt in the morning, cheese with my lunch or evening meal and milk with a couple of cookies right before bed. But then, I have always been a dairy girl so this is no hardship!!
And I hate skim anything, skim takes the taste out. Rather than low fat cheese, just do what the Fab 5 guy from Queer Eye says: "eat a variety of foods, all food groups, just don't eat so darn much of it".
Love that programme!!!
Clare