There are 139372 registered members on the KSP forums, and 89 light green members. So, for everyone that gets into the light green group, there are 1565.977 accounts that don't. While not all of those accounts may represent one person (forgetting you had an account, passwords, spam accounts etc.), that's still a lot. Still a rather prestigous group, I would say. Of course, imaginary internet points, and all that. As I said before on another thread, you can be a great poster (but not have an amazing rep-to-post ratio), I have a higher ratio than RoverDude, for instance, and he publishes so many mods I've lost count