Wouter,

To compare prices, you should compare boats boats with same equipment. Hobie Max and SL16 priced are complet including snuffer and spi. The Nacra 500 that should be compared is the Nacra 500Sport, with MNX Sails, snuffer and spi.
Price in Switzerland for this boats is CHF 21'590.- so about EUR 13'100.-

Now I agree with you the Nacra 500Sport many better fit a non regatta club than any other boat listed. No boom and more volume, larger and a little longer.