Interesting, though I do not necessarily agree. Put simply, I think a CD collector is someone whose main interest is to complete a particular CD series (like for example the "Blue Note Works" TOCJs) and/or to get as much music as they can by a particular artist/group, including all the various versions/mixes/masterings/etc. they can lay their hands on, no matter ìf it's any good or not. In other words, they are completists.
Next question: does a CD collector actually listen to music? For instance, there are many people on the Hoffman forum who are collectors in the sense I described above and who give me the impression that they're not in the least interested in the music they're buying; if there's anything they listen to, it's sound.