I've always been the opposite. I can't stand coming home to an apartment filled with people. After dealing with chaos all day, I want to know there's a quiet, tidy place where I can relax. I dislike coming back and having to interact with people.
Of course it is 'wasteful' and expensive to take up a whole housing unit to yourself, but some (most?) people (especially strangers) in the US do not make considerate room mates. Actually probably long term only family members learn to live together in harmony (probably because they have to).