I'm at about 700 logs myself. we need 12k to access tier 2, and along with each tier, we can expand with more skill plots, such as mining ores, making food, and summoning minions. Some of the really nice options require over 40k in raw materials, just to make a single object; and that's not even counting the default requirments for upkeep and upgrades. So, when we say we need every available member to come help, we really, really need everybody to come help. In order to upgrade to higher tiers, we need a certain number of people to come to the citadel every week and work on the upkeep; or the whole thing starts to degrade. It really only takes about 20 minutes a day, but of course more than that is very much appreciated. And on top of all that, the citadel really is a great place to chill. Muscle's pictures don't quite do it justice because they aren't in high detail, but this place really does look beautiful. Here's what it looks like run at max settings: