If you're sued, and if they win, how can the court make you pay if you don't have the money. They can't squeeze blood out of a turnip. And they don't put people debtors prison any more. But that's "if" they win. But the chances are so slim that you got a better chance of getting killed in an automobile accident than you do of them "finding" you. If you're inclined to worry, worry about traffic conditions, not about the RIAA.
But what should be thought about and fought about is the concept of intellectual property. I believe Jefferson ridculed the idea. And it is only an idea. That idea can be challenged. What about the rights involved in Public Domain? What about the rights to knowledge, to information? When they had the machinery all to themselves, they had a monopoly, and they charged us for songs we weren't interested in buying. Now the shoes on the other foot. We got the techology to pick and choose what's floating around. Thank God, (if you believe in a Designer and Justice), and fuk'em. :D
