In an upcoming interview with VG24/7, the developers of Witcher 2 have stressed that downloadable contents should be viewed as a "post-sale service" included in the original price. This in contrast to most other developers, including Ubisoft, who defended their choice to charge €10 for the Heroes VI DLC in this Q&A.
CD Projekt's Konrad Tomaszkiewicz:
"Back when retail games were dominant, we had expansion packs. These were really large chunks of content, which were worth their price. If today's DLCs offered the same amount of content, they would be worth paying for, but in most cases players think they are overcharged for what they receive. That's why we offer expansions to our game for free. This is also a way of saying "thank you" to the people who decided to buy our game instead of copying it from an unauthorised source."
We agree with Tomaszkiewicz, not Ubisoft. The fact is that regardless of the amount of work put into it, the "Pirates... DLC contains too little to be priced as high as it was, or even priced at all. Setting aside the argument that the fans should be given the DLC as a way of saying "thank you for your support" (or in this case, "sorry for the way the game was launched in the first place"), placing such a price tag on such a small product does very little for the good of the business.
I think a better way of doing it is to release small DLC packs free of charge, possibly launching larger expansion packs later, charging money for those.