Also not to mention yes everyone who logs out in a house/dorm goes back to where they were before they ported home. Unless you are in a dungeon then you goto the previous spot outside of that dungeon. think of it as a way of starting the game where you left off. or a free return trip without using mana to mark your location or running across a world to get back to a place.
To explain the dungeon thing a little better, lets say you are in cave of solitude farming black lotus/pearls and a friend needs help in the labyrinth so you go, finish it and port to your house to place a new item or bank then log out for the night. When you log back in your are back in cave of solitude ready to farm more reagents without missing a beat.
P.S. Zeke I don't like the way your voice changed in Celestia. :(