I love FF14, and because of that, I have a 5 Alts. There are a lot of people who have Alts, because they want to experience the story using a completely new character, play style, job, etc.

I think it would be beneficial to be able to friend your alts on the same world. That would mean you'd be able to mail stuff and money to your alts. You could share your house with an Alt, cutting down on the housing situation, and would cut down on a lot of frustration in not being able to share directly with my Alts. As it is, I have a friend who I send things to, who then sends or trades with my Alt, and vice a versa, when she has the time. It would be really nice to eliminate this constant frustration.