Earlier quoted context omitted.
Assuming you agree with CD Projekt's approach to gathering piracy statistics, the community rewarded them by pirating the game in extraordinarily large numbers, despite the gesture of good faith http://gamespot.com/news/the-witcher-2-pirated-45-million-ti...
This falls prey to the classic fallacy of "piracy" critics, that all instances of piracy are effectively lost sales. In fact, there's little evidence this is so for most games. It makes sense that a game that can be pirated will be so by a higher number of people than those who pay for it, but this alone does not support the conclusion that the rates of purchase for a game that is extensively pirated are necessarily…
Also, the 4 million figure is total sales of the first and second games on all released platforms, not solely PC nor following the removal of the DRM, unless you have a source that wildly disagrees with mine. It would certainly be an impressive vote of no confidence in DRM if 4 PC million sales had occurred subsequent to the removal of the DRM, however that appears not to be the case. http://gamespot.com/news/the-witcher-series-sales-hit-4-mill...