Your skill will accomplish
what the force of many cannot
It's not really the PM community building these sites, it's people within the PM community that use other languages and have an interest in developing a site that reflects their needs and interests.
Obviously, no inventors of Java would show up at the JavaMonks site. It is possible that we get book authors. If not this, if there are enough people contributing to the site, it can prosper. Maybe there is an inherent difference in the types of people who program Perl or Java (or any other language). I think the desire to be part of such a community would draw users of all levels to it despite what language it is. Beginners to experts. Even without the language designers and book authors, it can function and can be a benefit.