Robin McCain, 31/10/2011 17:20:
We must also remember that the wiki edit interface and markup can be a little intimidating to a newbie, so opening an edit window and making no changes may be more common than we think. Are there any stats on this?
Yes, it was something like 70 % of "edit" clicks are not followed by save. It's difficuilt to tell how many of those were people (or even stupid bots) looking for the source text. Erik Zachte gave this numbers somewhere; previously, some wikiHow staffer at Wikimania did so (showing how they improved it).
Nemo