I'm probably not the first to point this out -- others have already remarked that it was about to happen -- but we've got to five figures.

http://thecostofknowledge.com/

Edit. +David Roberts did indeed get there before me. I recommend a visit to his page, where not only can you find a screenshot of the CoK page with exactly 10,000 signatures, but also a very interesting analysis of Elsevier's financial prospects.
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