Cheese Pizza, what's up with that?

Many people order cheese pizza these days. I simply don't understand why sacrifice the extra toppings when you are paying the same price. Maybe people are just plain like that, I don't know. There are toppings for anyone so I find it hard to believe that any one person doesn't like anything other than cheese. I guess what i'm trying to say is, what gives? Add some spice to your life, you know? Please fill me in as to why Americans these days order plain cheese pizza...it's driving me crazy.