Upload & Sell: On
Not pertinent to the 5D particularly, but the reason they don't want to make it easy to obtain is the data is inaccurate for a number of reasons. If you use different EXIF reading programs you'll get different counts on the same camera. I do know the cameras may be reading # images stored, actual shutter counts, mirror counts, or another piece of data (I think perhaps shutter button presses) and the program you use may report any of those as shutter counts. Plus newer cameras with video mode may get many, many hours of sensor use without any shutter actuations (you might not care about that, but you might if you see the hot and burned out pixels that result).
Bottom line is if you have access to any of several bootleg programs you can change or reset the shutter count in the EPROM, as can any service center (for that matter you can change the serial number). There are a number of repairs (circuit board replacements mostly, but some others) where the information has to be erased. The repair service might store it and replace it, but usually doesn't. As an aside, if someone has changed the shutter count, Canon can tell that it was changed and when, but not what the count was before it was changed.