I think that a lot of people are assuming that people pull into a F/J at 6 or 7 at night and stay the whole night. But a bunch of us that are still working and have kids have to make the most of our time off. When we head out I start driving after work and may not stop until 2,3, or maybe 4 in the morning. If you are camping in a campsite and I pull in at 3 in the morning, are you going to be real happy with me the next morning? Probably not.
Like Rangerman40, I'll sleep for a few hours and then head out first thing in the morning. Not only does it not make economic sense (in my mind), but I feel that I'm being a courteous neighbor by NOT staying at a campground and waking up half the campground when we arrive.
Doug