Of course the argument doesn't seem any good if you completely misunderstand it..
Let's say you're a small player with a legitimate patent. A huge entity is infringing. In order to make any money of your invention, you have to fight. But that can be very costly and risky. Instead, you sell your patent to someone specialized in this, a "patent troll". You get some money, they use their expertise to fight the big player.
Like selling someone's debt to a collector so at least you get some money.
Let's say you're a small player with a legitimate patent. A huge entity is infringing. In order to make any money of your invention, you have to fight. But that can be very costly and risky. Instead, you sell your patent to someone specialized in this, a "patent troll". You get some money, they use their expertise to fight the big player.
Like selling someone's debt to a collector so at least you get some money.