It's fun, it's cloistering, it's huge, and self-perpetuating. All of this is possible at your library. This recent blog entry from Library Mofo offers a wonderful beginner's how to.
End results:
Personal responsibility, decision making skills, creative writing and basic math skills, imagination, team work, deduction & reasoning, and opening the door to greater discussions of good and evil, justice, and engaging intellectual activity of a different sort----all in service of our biggest goal, which is attracting more folks of all kinds to the library. Many libraries do this. And there are so many games...
So I guess it isn't just the wacky world of wizards, after all.