lol yep :)
That has got to be massive amounts of information and history to keep track of; I could imagine it takes some creative systems. I've never used a world for more than one story line, and building a substantial feeling world for one is a lot of info even when it only effects a more limited perspective. I'm pretty dedicated to detail in setting and history myself, so a lot of obscure knowledge gets collected that never makes it into the story, but its creation still allows for depth, continuity and consistency. I can't imagine on such a big scale, but the idea of keeping that world alive and growing, ever more rich and complex with new perspectives and backstories -
there is something very appealing in it