Each coin contains 1/2 oz Gold, for a total of 1 oz per set.
You're paying not just for the gold, but for the rarity, collectivity and certification . Also paying for the preservation of the coins in the thick plastic covering and the box and packaging. Also paying for the certificate of authenticity which you don't typically get. It's a limited edition with only 7,751 sets available in circulation in the world. The markup for this could be $750. On average is around $500 extra.