I'm pretty sure the groups that regularly post have a mix of both casual and very active players, always willing to help out if we're not doing something else though, of course.
Of the people I see that still post in the Journal, Chronix posts pretty often and he's still on Ultros I believe. Alisha is on Cactaur. Agent Dee and I are on Coeurl. Tenchi no Ryu, Klutz and Kyuusei are on Hyperion. At this point I think the non-legacy/legacy differences are pretty minimal (except for the ridiculous housing prices).