From the existing data below can be seen that the members of Drupal.org which have level 7 and above is just 216 peoples from more than 80 thousand members, so level 7 is a big WOW! :)
|Count of rockstars||CTR Level|
You can read the complete data here.
The point of Certified to Rock is for determining community involvement and not supposed to be a tool to rank developer skill.
Note: The CTR level is updated approximately every 4 months, and the value can change at any time, it might be reduced or increased.