Lately, there's been an increase of people with the Loremaster title who have gone back and done old quests solely just for the title. I've had the title for a while, but I didn't go back solely to just get the title. Having the title hasn't prevented me from proceeding to do ofter left over quests though. Some of the quest chains you find while doing old quests are pretty fun and epic. I think people should take the time to go back and do these things for fun, not just because there's an achievement involved.