For people mentioning how Zone and Era get more updates: I think with the way the server is structured, more RPG-esque, it's kind of natural for it to be that way. Their economy is generally more immersive and they have more "activies" that make sense in context of the game.
What you also have to consider is how easy they have it. Era and Zone got to see the successes of iClassic first, and then develop around that. Both servers have their equivalent to towering. It didn't take some genius to come up with hats or towers, they just saw what was working on iClassic and went with it. Obviously I have no way of verifying this, but I wouldn't even be surprised if Era and Zone were allowed access to the scripts that iClassic developed for towers, and they built off of that. It was a lot less initial work for these servers to become big and successful, so they have more time and effort that they can spend building around the stuff that already works.