Because a reputation is based on what one does and not on who one is, that's why. PJ has evidence behind her. She doesn't hold herself out as an expert on programming. Her training is in legal research. The product of that kind of work is knowledge backed up by evidence. This she produces in abundance with friends on Groklaw.
What is your expertise? Programming? How does that qualify you to spout opinions on the GPL, a legal document? You have a bad reputation because you too often speak before you think. Groklaw has embarrassed you in the past because they did the research that you should have done. In other words, they did your job.
Groklaw speaks for itself. It has had a positive effect in the open source world and the legal world. It has earned respect because of its integrity.
You do everyone disrespect by suggesting that PJ has some unnatural influence on them.
As for not coming out in public. Society does not respect the privacy of "public" individuals. They can not go out in public and do the ordinary things that we lesser folk get to enjoy. They have to endure mob scenes, strangers being overly familiar in public places, and even death threats. None of these things help get the work done and the work is the only thing of real importance here. I would like to know the real reason that you need to know who PJ is? The fact is that you do not need to know who PJ is.