I didn't do the math, but I think the general principle is right: use tends to get concentrated in the most accessible parts of the area. Both times I visited Isle Royale, the boat was full going over (100 or so people.) The campground at the dock/lodge area was full, with no vacancies. Three Mile, the nearest "backcountry" campground, was full the first night; that "crowd" of 50 or 60 moved on to Daisy Farm the next day - and when we left Daisy Farm around lunch, we didn't see more than 5 people the rest of the trip, until we returned to Three Mile the night before we got back on the boat.