Tim will probably chime in, but bascially that feature (displaying it) has changed over time.
I believe at the administrative level they have the power to have none display or else to default to the user choice (like you selected). A long time ago it was defaulted to user choice. But after some privacy concerns and data mining of emails from the site, the administrators turned it off. So now none display.
I may have muddled the history, but I think the bottom line is that individual email display is turned off at the top level.
When signing up it says do you want to have your email address listed so everybody can see it. I don't see anybody elses or mine for that matter. Anyone know what to do?