You get your money's worth, but sadly, most pizza shops only put (at most) two mushroom pieces per slice, then charge an extra $5 for it. Sometimes I get a plain "take and bake" pizza at the grocery, then I can put what and as many of what I want on it. Usually vegetarian style with mushrooms, peppers and black olives. I am not a fan of the sausage that is put on most pizzas. To me it always tastes musty. Pepperoni is okay, but I try to avoid it because of the fat content. The cheese is bad enough with the fats.
