There is nothing more attractive to a college student than free food. Being a cheapskate in search of free food is part of what it means to be a college student. When I was a senior in high school, I witnessed a friend of mine, who had recently become a college freshman, stuff five packs of Nutter Butters into his pant pockets. I was baffled by his uncharacteristic behavior, and I marveled at the sight. His reply: "Just you wait a year." A year later, I now sneak food out of the dining hall like a champion. It's indisputable and undeniable. College is filled with free food, and more specifically- pizza. Everywhere you turn there are events posters using the magic phrase "FREE PIZZA" to lure students to attend events.
"Come to hall council! FREE PIZZA!" "Come weave baskets with the multicultural club! FRE PIZZA!" "Come to a lecture by Professor Collons on the biological composition of stars! FREE PIZZA!"
But why pizza?
Pizza is cheap. Thus, the establishment, wishing to provide free food for their students, provides endless amounts of pizza, because it costs next to nothing and is filling.
College kids love pizza. Thus, groups cater to the tastes of their audiences and provide what they want-pizza.
Sub Theory A) College kids like pizza no better than any other food, but the ready supply of pizza available to them has conditioned them to love pizza.
Sub Theory B) College kids like pizza because it is essentially cheese and bread-two of the most mild, basic, universally-liked foods known to mankind.