Here is more evidence that US trade restrictions have just moved auction business overseas. See
http://www.huffingtonpost.com/2012/04/04/chinese-song-dynasty-ceramic_n_1402246.html?ref=topbar
There was a time this bowl would have been sold in New York. However, trade restrictions encourage sales to move abroad, even when the specific artifact in question may not be subject to restrictions.
Why have an auction in the US, if you can have a bigger one with artifacts from all periods in Hong Kong?
Wouldn't the New York city economy have benefited from auctioning off this piece in the US?