Copy protection schemes don't hinder most legit buyers. Don't get me wrong, I'm not a fan of DRM and such and it's unfortunate that a few legit buyers do have issues with it, but to say that DRM hurts more legit buyers than it stops pirates is statistically wrong.
Epic and Valve have deeper pockets than most. They can afford to release content for free. I love that they do it, but not every studio can do so.
@ the DRM thing: are you kidding? Pretty much every game recently released with a controversial DRM scheme had side effects from it.
Example: Mass Effect. There were all sorts of bugs, glitches, and other crap on the PC version (again, a product of it being a console port) that were allegedly fixed by cracking the copy protection. And I've heard of a lot of these instances.
Most legitimate consumers HATE DRM schemes. For very good reason.
Also, at the DLC: think about if the UT3 fixes weren't free. Epic: "Well, we're going to release UT3 now, with its infamous UI and other problems, and later, we're gonna give you more content!!! Er, not free by the way." That would have been a disaster.
Point is, something like Shivering Isles was obviously a full-fledged expansion pack. And thus justified in charging for it. But something like some extra content that was planned before release, but charged for after, whether to address a deficiency or just add stuff, is very disheartening.
L4D2 is in a grey area, which is exactly why there's so much controversy over it.
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