The US Supreme court thinks that if your claims in a patent case are bad enough, you should pay all the costs of both parties.
This is a good decision from the Supreme court, that sends two cases back to the lower courts to new decisions. Courts are usually not big fans of shifting the cost of a lawsuit to the losing side, but this decision of the Supreme Court tells them that in some cases that should be considered.
The main problem with patent trolls is that because they don’t produce anything there is nothing that they can be counter-suited on.
See more about this in the Verge.