Did Two Worlds II have DRM on PC? If not, that may partly explain it's good sales. I know I didn't buy the PC version of DKS because of SecuCRAP. Luckily, I have a 360, so I got that version instead, but I would have preferred the full fat PC version.
Can't find it now, but another poster put a link to an article by the CEO of CDProjekt about how all DRM is ultimately self-defeating. I can see The Witcher 2 being a massive success, with such enlightened thinking at the helm of that company!