I'm in a guild that has god items. You know how many times I've used them outside of brewing? 0. I still WoE. I enjoy WoE.
I'm not sure why you think a high-economy castle should be opened more than any other castle. EVERY castle could be a high eco castle if more guilds could successfully defend. You're asking for a guild that already works hard to be arbitrarily held to higher requirements for additional defense than anyone else would be simply because they have invested more into their castle.
If we opened up a new WoE time for other time zones and opened separate castles there's no reason a guild based on those time zones couldn't build up high economy as well. Why would we only open a high eco castle from the current time zone WoEs? That's not at all fair.
I'm not even sure I understand why you have an issue with this.