Thomas Dunlap, the lawyer running this under the name US Copyright Group, isn't looking to take any of these lawsuits to court. The whole point is to find out who these people are and to send them legal nastygrams, that come very close to your garden variety extortion letter -- telling people that they'll drop the lawsuit if they just pay $1,500. It comes across as a classic "protection racket." "Pay up and you won't get hurt."
These guys don't make anything, don't own any copyrights, but sue people left right and center and sell them blessings of MPAA/RIAA for a cut. Professional sue-rs, eh?