Sedley, thanks for the link. See below a quote from the article:

"Among the hallmarks of trolldom are lawsuits brought largely for the purpose of exacting hasty out-of-court settlements from defendants who can't afford to fight. These lawsuits are often sprayed out like machine-gun fire, aimed at dozens of companies at a time. Typically the plaintiffs do minimal research to determine if they have a legitimate case. Often, at the first sign of return fire in court, they withdraw — after all, pursuing a lawsuit to enforce a patent can run up six-figure legal fees. That's not the trolls' business model."

It's PTSC's model.