Definitely! I would love to give my alt access to my main's house. I'm cool with her having an apartment in the same ward "up the street" so to speak, but it would be very handy if I could give her access to my garden plots and other features. Especially if said house sharing came with a kind of house vault I could use to pass items and gil between them with. Not having to bug other people or use the company chest for that kind of thing would just be the cherry on the top.