It depends on the "troll." If you're Intellectual Ventures suing Microsoft over arguably legit patents, then you have put a lot of money into the case. But that's not "trolling" in the same way as in the X-Plane example, and it's arguably not something that needs any particular deterrence. There are valid economic arguments to be made in favor of NPE's in that context.
Th X-Plane case, however, is what I think most people on HN tend to be worried about. An entity coming at you with an obviously invalid patent, and going for volume: hoping to get a few hundred people to pay a few thousand in fees each hoping nobody will litigate. It doesn't cost anywhere near $50k to throw a quick, cut-and-paste lawsuit together.