"they're not likely to knock on your door or mine."

So it's "I'm alright, Giok..."? And that's good enough?   

They don't have CCTV outside my house or in my street, and I wouldn't much want it. All right, there's been the normal amount of undesirable behaviour going on over the years, like any street, but being under constant surveillance is a price I don't want to pay for reducing it. And that's just in the street outside my home. And if you're living in a van or a tent, outdoors is pretty well as much part of your home as much as indoors is.

As I said above, if there are sites that people don't want to live in, there are likely to be other factors than not wanting to pay for the facilities. Giok's cited example demonstrated one such factor.