But if I steal your buggy, then you are one buggy poorer. It is a physical object.
If I copy the information on your CD, then you still have all that information yourself. No one is poorer.
If the music industry don't make their CDs uncopiable, and nevertheless put them out into a market saturated with huge hard drives and mountains of blank CDs, then that is their decision.
No one is poorer? Um, what about the copyright holder, which is neither you nor me? That's who is infringed in this situation, and that's who copyright law exists to protect. And that's who becomes poorer when unauthorized copies of his work are reproduced and distributed.
Go ahead -- now it's time to roll out your "public library" or "Blockbuster Video" analogies. Or maybe you could go with the "only two good songs on a CD" angle. Or hit me with the "overpriced" line. Or maybe the "record industry is corrupt" rationale.
All of them are just as easy to shoot down as the faulty logic you displayed above.