Of course the wait is what keeps people playing. At 1st they only worked on the underground pass chain by itself But now we have a lot of chains: Mystque quest chain,mother mallum quest chain,fairy tale quest chain,and now a cold war chain! But note that the have too much chains in progress. If it goes out of control ppl will send complainets. There are also non-story quest chains that they could update freely. Also the underground pass quests arent even finished! [these spoilers have been deleted at the request of another poster] The only quest chain that might be truly finished is the mournings end quest.