there are automated bots out there, programmed specifically to trawl forums and blogs for any and all email address, and auto scripts to strip addresses out of URL's it is a big problem, even malicious cookies can do it through advertising banners, it is fairly easy to stop within a private board where no posts are visible until you have logged in, but for this kind of site/community, that i would think is not an ideal solution, so, as site admins have taken the time to do what they can to protect your email address, it is down to each individual user to take responsibility and be careful what he posts.
perhaps people should use the personal message option rather than emails ? does anyone know if the site sends emails on receipt of a new personal message ?