The argument that most pirates don't turn around and buy the game/movie/show/book they've downloaded isn't supported. It's truly is the other way around. I could give you many examples of artists--singers, bands, developers, fine artists, etc. and authors who seeded their creation online. In several cases they deliberately put them on torrent sites like Pirate Bay, then made a fortune because people liked their work enough to turn around and buy it. The benefits of this kind of exposure can't be stressed enough. The mega-corporations are being idiots and ignoring the unintended consequences that they are courting with their ridiculous witch hunt; consequences that are turning around and biting their whole business model in the butt. (Like thousands of angry consumers). And the early comment is right; it really ISN'T theft in any true sense.
Not every producer of content is convinced that so-called "piracy" is a losing proposition. HBOs "Game of Thrones" directors and producers for example, are openly thrilled to be amongst the top pirated programs (as is the author) and have said so many times publicly. Yet "gasp" they continue to rake in millions through video sales. To top it all off, it isn't the artists/writers/etc. who complain (mostly) it's the mega-corporations--like Hollywood. Worse, the artists and content producers aren't the ones who benefit from these draconian so-called piracy laws. If anything, numerous studies prove that these laws have a negative effect on creativity and innovation Yes, I'm including games and software in this ....Think about how stifling it is if you are constantly afraid that you might be doing something that is vaguely similar to something someone else has done. These mega-corporations use the threat of lawsuits against even legitimate content.such as "Open Culture", a site devoted to media that is no longer copyrighted at all. They send take down notices for noncopyrighted works, for public domain works, for creative commons works, for....They send take down notices for content that has nothing to do with them at all and that is not the way the law is supposed to work. Hollywood is also famous for deliberately leaking content and stealing from everyone else. Worse, the artists and developers don't benefit from these restrictions and neither does the consumer. It's an imaginary problem. For more information and a well-balanced look at this whole issue check out techdirt.com. They explain things very well--including why this whole idea of electronic piracy is essentially nonsense and a losing-sum game.
Why would someone with an expensive machine pirate software or games? Trying it out is likely the most realistic explanation. Statistically people DO try and buy.