Most A-class sails buy boats, the don't build them! You can't compare the price of a things that you buy with a pile of carbon fibre that in theory could be assembled to a nice rigid wing sail.
In the beginning of the "evolution" the designs would change quick and your wing would get outdated fast and require each sailor to spend loads of money upgrading. How many A-class sailors do you think would show up at the worlds 2013?
If you can get a quotation from Hall spars for a wing mast, complete ready to sail, below 10 000 dollars them I'm really surprised. The wing mast should of course be painted, durable, low weight and survive a "mild" pitchpole.
