Here is how I see the cities
Halas=> brrrrrrrr and far.
Main exports: Snow, and chest hair
Oggok=> Conveniently located next to nothing of value. Also far, bad people live next door.
Main exports: Sweat and incomplete alignment quests
Grobb=> Evil city in a game where evil races can use the good city, but not vice versa. Fun place to kill things. Gateneck that is poorly implemented due to being dependent on a main quest faction.
Main exports: xp and screams
Thurgadin => Better known as that vendor place by labyrinth.
Main exports: Ice and short
Erudin=> Better known as the place you run through on the way to first ruins or erimal.
Main exports: Charms and foreheads
Erimal=> Where charms, relics and the good tomes come from.
Main exports: Quests and relics
Underhill=> Escape from teh plague because no one ever comes here.
Main exports: Ladders and concussions
Kelethin=> People live here?
Main exports=> Wood and tumbleweeds
Athica=> One of the few viable cities. Formerly one of the less popular cities, the high noob and beggar population of newport drove many to it. This had a major effect on its popularity.
Main exports: mid tier groups and buffs
Newport=> Formerly top dog out of the three viable cities, started to lose ground to athica when athica got a gateneck. This is mostly due to athicas convenience factor, and lower population of lower level players, as well as it's perceived crash rate.
Main exports=> Lag and low level quests
Sadri Malath=> Quickly becoming the top dog of the viable cities. This will probably gradually change as the population shifts to it. Large numbers of higher tiered players congregate here.
Tipt=> Most skip. Extremely large, pain in the ass to run through, deep not that popular, most people just choose to go to the vah camp, rather than run here, which does have a gateneck.
Main Exports: Hairballs
Murk=> Rest stop for ikisith xp and questing.
Exports: Questing, FRAWGS, and gruplok fences.
With extremely minor additions, all of the cities would become viable in time, as has been said in the 4 billion other threads on this topic. All but athica, newport sadri and grobb need gatenecks.
Grobb needs modifications to its quest so that it is not directly tied to a main quest faction that becomes kos to 66% of the players on the server (if we're assuming equal distribution, which is doubtful. In the past I would have bet on more silver crown than anything else due to the initial quests. That is probably falling). The others need gatenecks if they are ever to become anything more than the occasional place to pass through, or an anomalous guild meeting place (usually for limited duration). The Refuge doesn't even bear mentioning for various reasons. The murk would become viable with the addition of a banker. Currently it is semi-viable, but only really because the other option is poor, and ikisith is far. Both lack most facilities, but considering tradeskilling is at best capable of minor profit, and consequently most people don't want anything to do with it, this will not do much to hurt a towns popularity.