There is a good and a bad side even when it comes to torrents and music... On a general scale the groups may be presented like this:
1 - Some will download torrents no matter, even if the album is offered as a "Name your own price" release at bandcamp.
2 - Some will download torrents "en masse" due to reviews/user input or for researching/exploring unknown musical genres and then order the CD or buy the download for the albums/tracks they like.
3 - Some will download torrents which are unavailable in online stores as a download or physical CD.
4 - Some will not download torrents no matter the reason.
Two of the groups are easy enough to classify: Group 1 can be dismissed as potential customers as they will not buy no matter, and group 4 are guaranteed customers.
Group 2 and 3 are somewhat different and much harder to classify.
Using myself as an example, I have used torrents to explore unknown musical styles and artists to broaden my musical horizon. Summing it all up, I have bough more than two thousand CDs as a result of these explorations.
These are sales generated solely from News/Usenet, blogs and torrenting.
While the music industry seem to think that I would have bought all downloads I have listened to during my explorations, if I was unable to download, the truth is that they had lost more than two thousand sales.
Today, I use a mix of:
* streaming to listen to new releases
* torrenting and blogposts to broaden my musical horizon even more. I'll rather take the advice from true music lovers than from 10-20 second T.V. commercials.
What the article shows is that I am in no way unique and that people for the most part will choose legal alternatives if they exist.
A final note to the music industry from a true music lover and anthropologist - No sales can be expected when you only present an empty shelf when we come looking.