Valleyhome is a population sink, but its also far less of an awful one than most historical examples. To be fair, this has more to do with the fact that its harder to raise children in the city than because it has a catastrophic mortality rate, and given the standard childhood mortality rates this means that population growth is still mostly confined to the rural regions rather than the urban ones. The People's mostly communal ownership does mean that they are more willing to cycle people in and out of Valleyhome, so there can be a bit of "Grow up in the rural areas, come to Valleyhome for an apprenticeship, leave a decade or two later as a master to work out in rural areas again and raise a family there" for the artisans.