Gness- I think if you read my post you will see that I had a proviso of not leaving litter and being a general arse. If you missed it let me reiterate it for you, we park and don't leave litter, make a noise or generally seek to annoy other people, so therefore I don't believe that we or most other 'wild campers' cause anyone any problems.
Dave insurance isn't an issue as long as the camper in question is considered to be a classic vehicle- it comes in at less than £2.5k for me to be the main driver of the vehicle I have in mind, assuming I was 17 at the moment. It's likely to go up somewhat by next year but not enough to make it prohibitive.
I can see people's issues if the campers in question cause a fuss, make a mess or otherwise get on people's nerves but really what is it to anyone if they don't? There seems a lot of 'disgusted of the caravan club' attitude here for something which if done politely doesn't affect anyone whatsoever. As for 'free culture' yes bring it on, many bands and other artists are doing far better financially within this culture than the old culture of record labels calling all the shots and strangling contracts. Times change thankfully.