Your housing is where you will put your goods up for sale bazaar style.
People can goto a centralized broker in the city and buy your goods for a slightly marked up price, or they can travel to your house and buy directly from you. Also, you will be able to buy trade skill machines and work your tradeskills while at the same time having things for sale.
Although not implemented at this time i would assume there will be some form of storage you can do there as well.