As strickland said, games are a gamble.
As a consumer, it is fully my right to determine what games deserve my money. No businesses are hurt in the process: I will NOT buy a game that I cannot test first.
When games have good, complete, indefinitely accessible demos, I have no need to pirate them. Kingdoms of Amalur, Spec Ops: The Line... Notorious examples of games I would never buy but was initially interested in. Or Mass Effect 3. I wasn't interested in that one (I wouldn't even have pirated it), but it had a demo so what the hell, eh?
After a test drive, however, I bought none of them... And for this reason I'm not going to blindly throw money at things: I will evaluate them first.
Whether demos are a solution to the "piracy problem" requires you to assume several things:
- Piracy is a problem (according to unbiased, scientific studies like the one from the Swiss government, or Dutch Institution for Information Law it isn't)
- Piracy hurts sales/revenue (Again, according to the avobe, it doesn't: In fact, the conclusion to the study was that it actually INCREASED revenue, as media-enthusiasts both pirated more AND spent much more money on average. At the same time! Yes, the filthy freeloading pirate spends the most money!)
- Going through the costs and hassle of developing, hosting and distributing a free demo is better than piracy/no DRM, which sorts itself out (remember that the game will be cracked anyway).
- "Making your LEGITIMATE PAYING CUSTOMERS deal with intrusive DRM (or any DRM at all) while pirates enjoy the media freely" is a good business strategy in any universe
I like riding the currents more than I like swimming against them, and filesharing IS the norm right now and continues to grow and establish itself as the future of media distribution.
I also don't like gambles. Or bad games.
SOURCE for the Swiss study (It was actually five separate studies, I believe): http://www.pcmag.com/article2/0,2817,2397173,00.asp
(Or just google "swiss government piracy study")
SOURCE for the Dutch study: http://torrentfreak.com/file-sharers-buy-more-movies-121018/
Basically, welcome to the 21st century.