The user pref "Only email me reports of changes made by other people" is confusing, even for an experienced bugzilla user. It would be much easier to understand if it was "Email me when I make a change". This would be more consistent with the other two options on the page.
It would need to be "Do not email me when I make a change" instead for one since the checkbox means that. And this does not sound any less confusing to me than the current wording. This is also the default wording used by mozilla.org so it should probably be fined upstream for this one.