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<p>Perhaps it may also depend on if the school is one where many or most students move to off-campus housing after their frosh or soph years. In such cases, they are choosing housing and roommates on their own, without the added variable of the campus housing office, random housing or roommate draws, or needing to replace a roommate who moves out (since many off-campus housing options allow for +/-1, although with the costs being split among +/-1 people). Of course, there can still be drama in off-campus living situations.</p>