It costs millions on the defense side. The plaintiffs don't have any documents to discover and the attorneys are usually the partners in the scam, so it's almost free to them. That's the whole point of trolling in East Texas: the court rules make it even more expensive to be a defendant and cheaper to be a plaintiff.
[1]http://www.ipnav.com/blog/ptab-trolls-going-after-patent-own...
The legal system still seem to be broken, because it should offer a large reward to the "PTAB troll" to be paid by the patent owner so that instead of settling they would go through and invalidate the patent, while still getting money from the patent owner, who would also lose the money from the (non-)infringer.
Are you sure? Litigation isn't always expensive if you're doing it in-house.
Work costs money, sure, but I'm skeptical of 'millions of dollars.'
Sounds like an opportunity to me. They might have existing licensing revenue and they are going to be wondering what to do if patent trolling ain't the name of their game anymore.