I've been thinking about doing this forever, but I play games so intermittedly. I know quite a few people who are very enamored of World of Warcraft - oddly enough, WoW pretty big in the Myst game series fan community, including developers.
I know you also played
Guild Wars - did you stop playing it?
I have
WoW and Guild Wars, but I haven't started either. I know Guild Wars isn't exacly like a standard goldburse, but I might start with that later - no subscription fee.
http://www.goldburse.com