Did the other thread cover used cd's?

If you buy a used cd from someone/somewhere, the artist doesn't get any royalties, right? If so, one copy of an album could be used by any number of listeners throughout it's lifetime, but the artist would only get the royalties from the first consumer. If the argument against file sharing is that you are listening to music without compensating the artist/label for it, then couldn't a similar argument be made about the market for used cd's?