Raaus pilot, you have quite obviously never seen an avdata bill before and you wouldn't have unless you owned or operated a ga aircraft. Most council airfields that charge use avdata for the billing of visiting aircraft. I'm not talking about your usual airports that have a collection box. Most touring raa aircraft would be oblivious to the fact that they are racking up bills until such time that they receive one eventually, if at all. A I asked 4 raa a/c owners today at a field during a BBQ and none of them had ever heard of avdata.