Does no one else think it's on purpose?

I mean, while it's a pretty time consuming and boring thing to do, in theory if you could send gil/items between each character.... you could just do the storyline over and over on various alts, and send the resulting gil/gear/materia to your main. Unlimited gil. Unlimited retainers/ventures. Seems to me that SE doesn't WANT people to be able to transfer things among their alts.