I too would love it if I could send items to my alts. Yes, I know one avatar can do everything, but I enjoy having multiple, specialized characters. Freshens up gameplay a bit.

Not being able to share items between my characters -- especially stuff that one wouldn't need, but the other does, as, say, a crafter -- frustrates me. It's a smallish issue, I suppose, but right now it seems like a pointless restriction, and one that limits my enjoyment of the game. Solutions: enable friending of a player's own characters (perhaps this could be automatic, to get around both parties needing to be online), an account-wide bank vault (I like someone's suggestion of accessing it in an inn room), or allowing a retainer to send things between alts (perhaps through other retainers). The last two might help with the gold/gil-sellers problem, as you have to be a certain level to use them.