tomimt: The most important reason why GOG games aren't in torrent sites is, that there's no need for them to be there. I'd say 99% of all the games GOG sells have been piratised ages ago, so there's a quite supply of Fallout or King's Bounty around. And people, who buy from GOG do so, because they want to do so and don't want to throw those games in torrents.  
 And pirates on the other hand, might have realized, that they've been moaning for huge game prices for ages, so they'd look even more dick heads, if they'd actually threw GOG games around. 
  On the other hand, many of those old games are hard to find now - or they run badly on modern systems. Nearly every game I bought on GOG, I own on CD as well but I bought them because, for starters, the installer makes it very easy, and because they fix compatibility issues.  
 I'm buying almost no DOS games anymore, though, because I already have them set up in DOSBOX Game Launcher & my personal DOSBox settings are better than the standard conf file GOG uses. But as long as GOG keep churning out Win 9X games that are patched to run well on modern systems, I'll keep buying those.