Basic problem is that even after you have progressed in terms of weapons, armor, and skills, you sometimes you want to go back to Haven to either meet a friend, greet new players, check the bazaar, etc., really, any number of reasons.
If someone who spends their time at the deeper levels wants to go to Haven they must accept that they'll have to work back down to Emberlight, 18 levels deep. The problem is that this is kind of boring and grindy. Often these are the same levels you can play when you are deeper except the monsters are neutered, as is the treasure.