I don't think pizzas or the artisan rolls (which are what I've seen) are loss leaders. Even at $10 a pie, they're probably making a buck or two. Pizza is cheap to make, so is bread.

I'd be surprised to see them hawking chickens or hot dogs in the line but who knows. Costco goes hard on customer satisfaction, that's why they offer regularly-stocked loss-leader items like that in the first place.