Many large schools have campuses spread out maybe not as far as Rutgers but similarly. I would regularly attend our peer universities on recruitment trips and go on campus tours. The tours centered around main campus and if you chose to go to specific professional schools, business, engineering etc… you would board a separate bus or arrange a separate tour. I can’t imagine there are many people that choose to attend a tour of all 5 campuses. That is an exceptional waste of time.
Except we don't have a "main campus" and I'm telling you, quite literally, that the numbers do not back your assertion. There are smaller groups for schools that provide tours (red pine ambassadors, SEBS ambassadors, engineering) but the folks that came to the visitors centers invariably chose the five campus bus tour over walking up and down college Ave. That's why we do one, and not the other. As for, "I can't imagine there are many people that choose to attend a tour of all five campuses", whether you can imagine it or not, we hosted over 40,000 and sometimes have as many as 400 going in and out of the center at once.