CDs and cars aren't the same thing. For example, if you steal a car, you get a little bit of jail time and a small fine. if you pirate a few things, you get fines upwards of $100,000 and 15 in prison. There's something severely wrong with that in my opinion. Rapists get less jail time than people who pirate onine.
I also think those who put the stuff out there are bigger assholes than the people who download it, especially in the case of porn. There's a website with TONS of recorded cam shows, and a lot of models don't know they're being recorded(and would never be okay with it being put on a tube site!) and don't know where to look, so the videos stay out there forever. Some moron trying to get off comes across the site and has no idea he's watching stolen content. Who's the asshole here? The guy going around recording shows just to hurt models or they guy who thinks it's just another porn site?
I don't think an individual is going to get that kind of time, but an operation creating hundreds of fake cd's, or dvd's would. One individual, caught doing it will get a fine, but the maximum is unlikely. Grand theft auto is also a far more serious crime, and usually carries many other charges with it, such as fleeing and alluding, resisting arrest, etc., though I agree that rapists don't serve enough time, under any circumstance.
Roald is right, you can't compare porn and music. While you may have every right to your product...that product is your person. I can't speak as to how often it happens, but I would safely assume a great deal of what you do in a show, is the idea of the viewer, you would show your snatch one way or another, HOW you show it, isn't always your idea. BUT, when a musician creates a riff, or a melody, that is his brain child. Twenty guys might all have the same idea of what position you should pose in, but once a musician records his work, it's supposed to be a one time thing...barring the obvious natural chord progressions that will always occur when you're just trying to come up with something, that piece of music is forever an original thing. Though I don't believe there are really any more original idea's out there, which is why I personally think most of today's music sucks. Many artists themselves are guilty of ripping off their peers. Led Zeppelin plundered so many blues musicians it's pathetic...and don't even get me started with this rap bullshit. There pathetic claims that they aren't plagiarizing a song, only "sampling" a beat, or riff, and using it to create their own song is the biggest load of shit I've ever heard of.