one of the most prolific publishers of research papers in the world.
Their journals aren't in my field (they are all bio journals), so I have not heard of them, but is it true that they are that big? Their web site wasn't much help in terms of information on subscriptions or article numbers, or I simply missed it. Can anyone familiar with them provide any input?
Their data policy might work for the biosciences, but good luck requiring all the many TB of raw data from a particle physics experiment to be put up somewhere. And in some instances, like that one, the raw data will most likely be useless without knowing what it all means, what the detectors were, what the detector responses are, etc. etc. etc. For experiments where it takes man-months or man-years to collect and process the data, making it all available in raw format will largely be a waste of time.
In general, at least for experiments done in the lab that use specialized equipment, raw data will not be very useful if you don't understand what you're collecting or familiar with the equipment. You can end up with situations like that guy who took the Mars rover images and kept zooming in until he saw a life form.