That's exactly what Marriott did to me. I ordered a 713 reward and told them I would be using it for 2 rt coach economy tix on Delta to Guangzhou, China for which Delta requires 80,000 miles. Marriott does have a location right in Guangzhou. They went back and forth on this with me, giving various excuses, but ultimately the final word from Marriott was that 60,000 miles per ticket was the maximum they would give. Have not heard of any instances on this board where more were given.