I don't think the "sampling" theory is a good argument. Sure, some people would like to sample something before they buy it, and in that respect its great because it will force companies to put out better products.
But, most of the piracy is due to people snatching up stuff because they know there will be no personal consequences.
If everyone could just walk into Foot Locker and take 100 pairs of shoes, and not have to worry about a cop chasing them down the street, they would do it. Piracy advocates will make lame arguments about shifting the paradigm because they're tired of making corporations richer, with no knowledge of how basic business works.
If a musical artist sells a CD or mp3 album for 9 bucks, and you download it off torrents for free, you're bypassing the price they've set to have their product go into your ear. Simple as that.
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