I think he meant the guild pays a fee to buy the guild storage not a fee for each item, unless I am misreading it. Either way not a bad idea gotta admit but it would need a limitation system to stop abuse a.k.a X member gets hacked, takes all the items, guilds screwed or X member account shares, him and his friend fall out so he logs the account and robs the guild bank to give him a bad reputation.
Sharing items between characters, don't see why not was fed up of logging onto 1 char to go somewhere secluded to drop it and have an alt pick it up.
/Zelda