I'd go one further (in the other direction). If someone "ran the numbers", I'm quite sure they would have made them public. Because no consumer wants DRM (some are ambivalent, some hate it, but no one is like "oh, thank goodness, DRM"), and the inclusion of DRM by other companies does not threaten your market share, a company has nothing to lose, and only to gain (good will) if they were to release those figures and explain to their customers with cold hard data why DRM is included.
None have done so. Ergo, I am quite sure no one has "run the numbers"; they have, as mentioned, eyeballed them and used them to justify their own biases, as humans are wont to do. And either do not have enough of an analysis to release, or realize it is so easy to poke holes in that they shouldn't.