It's all about supply and demand , like anything if you don't like the price you go elsewhere's , or you stop buying however were a bit snookered with petrol and ets , but no-ones actually challenged the ets company's about how much there charging , is it indeed a fair price ??? and yes they have the monopoly on there own rings and therefore can charge what they like !!!! so long term until there challenged by the consumer bodies we'll get a very poor deal