I think its about time you upgrade the guildsystem - it is so oldfashioned and outdated.
Invites to guild has to be typed and with all the weird signs there are in many names it can take time before you finally get the inv sent - it would be so nice to have a feature where you could just right click players name and have the "invite to guild" there.
Lower the insane prices on guildtabs! Most officers and a few members are happy enough to support guild that they donate credits...but come on - 3. tab is 7 mill and 4.th is 15 MILL ??? I know some MMo's make cash for guild for every mob that is killed..not a lot but its getting somewhere. Only option we have is to sell stuff for guildbank or donate ourselves. I know some guilds also charge a fee but in our guild we value the casual and pleasent environment so to charge fee for that, doesnt seem apropriate.
It would be great to have a log of people entering and leaving guild. Seeing the number on guildlist change between my daily logins makes me go take a look at log in guildbank to see if anyone has stolen from it again - and the issue here is not the stealing from gb, we have closed it now. But it would be great to be able to see who left and maybe find out if there is a special reason for it.
I hope you will take a good look at the guild system and make some needed changes.