College is as much for networking as it is for learning, if not more so. You never know who your fellow classmates might become. That drink you bought that guy from your sociology class at the campus pub might end up being the best decision of your life. We live in a world of, “It’s who you know.”
Now, don’t get me wrong, I definitely would say “it’s what you know” as well. College (specifically a 4-year degree — i.e., BS/BA) is about learning to think, rationalize, and socialize more than mastering any specific skills.