Separating by fads is a neat idea, though I doubt it will divvy up evenly. I suggest something like Competitors/Idlers/Inactive/Outcasts, though the last two categories wouldn't be filled. Maybe just Competitors/Idlers...though there seem to be comparatively few idlers on the list. Perhaps user levels would suffice, or maybe region would be best for simplicity.
The list of participants also looks solid. As such, I shall glance at this topic from time to time out of curiosity starting July 5.