i think their should be an update with housing all together. They need to delete guild houses, and rename them to "premium House" because thats basically what it is, you pay to get a bigger house, has nothing to do with guilds.
THEN they need to allow guild leaders to buy a GUILD House, and they should be able to give guild members POWERS to edit the guild house themselves. Therefore 25 members could be contributing to one house, making it a guild house.