Benefits of being a guest editor of a journal? In recent months, I've begun receiving invitations to serve as a "guest editor" for various journals from publishers I've worked with in the past that I believe are reputable. 

I recognize that there's significant workload for such an issue and very little, if any, compensation, but I'm wondering what the benefits are for tenure-track faculty to serve in such a capacity. Is it worth the investment to do so, relative to the time required?
Disciplines are typically organized in loose groups around a fairly small number of persons. They organize conferences, are editors, are on boards of professional organizations, etc. They are always looking for the next generation, new researchers who could take over when they retire. Being a guest editor for a journal, organize a workshop, chair a session, etc. signals that you might be the next generation. Having a reputation of being the next generation won't hurt when you aply for your next job. It is also good practice for when you become a regular editor.