It is the same reason why most people cancel their other interviews. For example, I cancelled my interview with Touro, CA once I got accepted into UOP. UOP is a better school despite its location (then again Touro isn't in the best location either). We all have our personal ranking of schools in our minds, and I think that Minnesota > USC but I still carry on my Trojan pride.Im currently debating where i should school this upcoming fall minnesota vs usc. i was just curious as to why you would suggest someone cancel their interview all together?
1. I don't want to spend extra unnecessary funds if I don't need to for travel and hotel to do another interview if I have gotten into a better school.
2. This allows other students to take up that interview spot.
If it's imperative that someone stays in California, then by all means interview at USC. It seems all my friends attending Minnesota seem to love it over there.
Hope this helps