I wonder if there are ways to legally insure against trolls. Say, a patent lawyer might open up an insurance. As a company, you pay a monthly fee of some amount (say $1000). If nothing happens, then money goes straight in that lawyers pocket, but if you're sued by a patent troll, he will handle the case for you, including going to court if needed. You could even further extend the concept with an insurance against any losses that might be the result of a lost law suit, thereby making the whole thing completely risk-free for the insured.

You'll have to run the math on how common these law suits are vs. what the costs are to run the case, but effectively it could be amortized over a lot of people, so it might make sense. Further, with time the trolls would realise that members of this union/insurance are not easy targets, so they would probably back off rather than going all the way to court. Thereby making it cheaper for the members.

Not sure if it exists already.