Fame
When it comes to issues of discrimination in the workplace, you're probably not going to be the one basking in some kind of spontaneous fame. Even if some widespread scandal is uncovered in which companies are suckering their workers into lowered retirement savings, or something, it'll probably be the workers, the employers, and the attorneys who get TV time.
You're what happens about two steps before all this, which means that you won't be getting a lot of press. No ticker tape parades for you, not matter how many cases of discrimination you expose.
On the other hand, the type of fame that usually comes from high-profile court cases isn't the fun kind. People love a good horror story, and courtroom drama supplies that in spades.
You just have to take one look at the lawyer trying to leave the courtroom and having cameras shoved in her face to know that sort of fame ain't all it's cracked up to be. Sure, a ticker tape parade would be nice, but being hounded by the press? No, thanks.