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People who don't know or care about DRM will buy a game/book whether it has it or not, but people who do care may decide not to buy if DRM is included. So what I would be interested in seeing is sales comparisons between companies that implement very restrictive DRM and companies that go without.
Spore had one of the most draconic DRM methods ever, and was also the most pirated game on the internet for a while, and didn't sell very well at all. By comparison, The Witcher received a patch that removed all DRM from the game just a couple of months after release (the developer explained that since their customers didn't like the DRM, they felt they should listen to the feedback and remove it) and it sold exceptionally well world-wide, given that it was the first release from a new developer that no one had ever heard of.
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