I'm pretty sure China and others would probably buy up every bit the IMF wants to sell.
An endowment would be created with the profits from the limited sale of 403.3 metric tons of the Fund's gold holdings. If approved, gold sales would be conducted in a transparent manner with strong safeguards to ensure that they do not add to official sales and avoid any risk of market disruption.
Avoid market disruption. Yea right. http://www.imf.org/external/np/sec/pr/2008/pr0874.htm