While I was researching this article I looked into the current incarnation of the game, Gemstone IV. Amazingly, I think some of the players of it have been active since c. 1992. I would imagine that's the longest-running internet game community, but maybe I'm wrong. A tiny party of me wanted to re-create my character from when I was 12 (Sylvanon) and start back up again...
I believe Simutronics now has some crazy pricing model where a handful of players pay a ridiculous amount ($100 a month last I checked) for the "Platinum" version of Gemstone, which is essentially a different server with only the elite players. I do sort of miss the austerity of a purely text-based game.