Lets say you're ballin on a budget. That means that you can only get 2 toppings unless you buy a specialty pizza. SO in that aspect, you're giving up one of the following for Pineapple:
Ham Bacon Sausage Chicken Pepperoni Salami Steak
So in that aspect... I am beginning to fear for the mental health of ANYONE who would put pineapple on a pizza