If you win then their patents aren't very valuable.

But you've also taken away (at least some of) their tools to troll people with.

So has the precedent of the court case you just won.

Typically troll maintains pool of patents. If they file bankruptcy, its an opportunity to shave them off clean and flush out their pool. Even if they had just one patent, it is still worth pursuing this because it puts strain on their legal resources to continue trolling. This is advantage to large company who practically have far more legal resources to spend then individual trolls.

The bottom line is that if all tech companies pubically takes oath like Newegg that they would never let patent troll walk away like that I suspect trolling would continue at the current level if at all.