I disagree.
If I like something I buy it.
Thus if I copy your work and like it I will buy it. If I don't like it I won't buy it. However if I don't copy it I will most likely never know about it and thus never buy it.
Now other things I might borrow and rather than turn on the radio listen to an MP3. But once again if I like it I buy it to support the artist. I just hate commercials and refuse to listen to them under any circumstances so this is the only way I experience new stuff I like. Plus my taste are not on the radio much.
The internet is the greatest thing that has ever happened to the industry. It just hasn't figured it out because it is blinded by greed trying to figure out a way to extract even more. But I fear they will kill the goose that laid that egg if they force DRM down our thoughts.