Possible guild money outlay:
Keep Upkeep (6g per hour if we ever claim a keep from R14 onwards);
Standards (2g per standard if lost, so far I think the bearers are taking this cost themselves, would like to reimburse, even if it is a trivial amount)
Bounty's - Yet to post on this, I'll elaborate more when I finish drafting my idea

Not sure what else really - probably more in future as Mythic expands the guild system further.
As for Items to the bank - the only tab we have right now gets full very very fast, I do try and spam about it in chat, but not sure people are aware they can just rock up and take items as and when they feel like it. Sticking them for negligible prices on the AH for Guildies only could be a good idea really

(I too remember bank mules and such in wow

)
Personal donations: rock up to the bank and use the deposit money section in the Guild vault tab at the 1st Altdorf
