I think the reason why it hasn't sold out so quickly is because the mint didn't release any of the pictures. People are skeptical and will wait till the official pictures are released before they make a decision. Look at what happened with the Royal Baby coins.
The price is insane. I know that the Mint had to pay licensing fees and everything, but I fear that the Mint will continue to sell their future releases at this price afterwards. Every time there is an excuse to raise their prices, they do and never go back.