The statement "wasn't college an investment" is a rhetorical question because it's more of a statement of fact than an interrogative statement. As such the speaker isn't looking for an answer, but is instead making a point.
I hope this helps. If it doesn't I could probably explain further.
Going to a university requires high school graduates to live far from home but this happens often some of the students have graduated recently and many of the graduates are reluctant to live far from home.
