Yes, it can sometimes be true by a few percentage points. However, here's the catch. It's not because these top players have higher ratings, it appears to be due to the additional tournament pressure in higher tier events. As mentioned above, it's more difficult to shoot the same score due to tournament pressure. But if you happen to be a local not affected by the same tournament pressure as those visiting town, you may be able to average a throw or two better scores and earn the better ratings. Note: those better ratings aren't just handed to you, you still have to earn them.