It couldn't be clearer from this Round 7 video recap from the offical website for the 2010 U.S. Chess Championship - only the top 4 count. The only other player who was mentioned in the recap was GM Larry Christiansen, who had a chance to make a break-through into the "quad." A sound bite from Christiansen after the game was telling. To paraphrase, he said that the tournament was over for everyone else except the top 4. He's right. Everyone else is second thought, including Christiansen. For a national championship set-up, that is pathetic. And an insult to the players who didn't make the "quad." They didn't come to St. Louis to pick their noses, but they may as well have.
Here is the video recap.