It's a touchy subject.
Just put yourself in the Artists, or developers shoes. (And yes, disregard the fact they are already worth millions...It's not the point.)
Examples..Norton Security. The minute I purchase that product from them, as far as I'm concerned, I should be able to install that program as many times, and on as many computers in my household as I wish, but low and behold, this isn't the case. On 2005 I exceeded my allotted installs, So had to go out and buy 2006.
For those that did the illegal kazaa and just downloaded songs, movies, programs till thier eyes bled, Yes, I do believe that is illegal and should not be done.
Now if I purchased songs, programs, movies first, from a site like sharebear? or others I believe, and somehow lost them, Yes, you better believe I'm going to illegally download those again somehow, because I already bought em once. But you also better be able to prove you did if caught.