Originally Posted by raiden031
The only significance of being a National benchmark player is that your rating is weighted more heavily by your play in the playoffs and also that it is used as a way to level out the NTRP levels across the country, by comparing all the league players against the benchmark players either directly or indirectly.
A national rating is also visually verified. There are verifiers watching the matches, especially the final four matches, and they determine your rating based on your computer rating from all of your match results and then those ratings get tweaked based on the visual verifications. I'm pretty sure that the full level bumps were largely based on visual verifications in an effort to combat the overall trend in the computer system of excessively low computer ratings.