I have often wondered but never asked, would the large number of people, on here, who like/love FREE Aires, with EHU's abroad, be happy if their local council spent their Tax Payers money providing similar free site facilities near their towns and villages if they were occupied by foreigners most nights ??Are you sure? Many Aires in France are free. May pay a couple of Euros for water, but that is free on some. The most we have paid for an Aire is about €12, so about a tenner. Not many CLs and CSs charge as low as that nowadays. £20+ more likely.
But the main advantage is that most Aires iare in interesting villages or towns or within easy walking distance of them.