If one buys a CD, rips that CD, and then sells that CD -- well, if you keep playing the music after you sell the disc, you are pirating the music. Oooh, "pirating" sounds almost romantic, so let's use the actual term: you are stealing the music.
For me, the pleasure I've gotten from musicians makes me not want to steal from them. I admire their work. So even though I've ripped over 2500 CDs and play them only through my music server, the discs themselves sit in storage.
Dave, who could imagine someone here either defending ripping-and-selling or saying it's not a bad thing but what's both illegal and immoral remains that way no matter what because it's not a question of opinion