Once measured... its legal for the rest of it's life.

Think of the 70 charge as insurance on the 3500 you invest in new sails and battens so that you KNOW you are playing fairly AND you have the best sail you can get for your money.

Measuring sails is not a new concept... perhaps the F18 and N20 class should look at how the dinghies, A cats and Tornado's do it and pay for it.